test running / reporting improvements (#797)

**CI/CD improvements (validate.yml):**
- Add test reporter (`ue-foundation/test-reporter@v2`) for all three platforms, rendering JUnit test results directly in PR check runs
- Add "Trust workspace" step on Windows to fix git safe.directory ownership issue with self-hosted runners
- Clean stale report files before each test run to prevent false failures from leftover XML
- Broaden `paths-ignore` to skip builds for non-code changes (`*.md`, `LICENSE`, `.gitignore`, `docs/**`)

**Test improvements:**
- Convert `CHECK` to `REQUIRE` in several test suites (projectstore, integration, http) for fail-fast behavior
- Mark some tests with `doctest::skip()` for selective execution
- Skip httpclient transport tests pending investigation
- Add `--noskip` option to `xmake test` task
- Add `--repeat=<N>` option to `xmake test` task, to run tests repeatedly N times or until there is a failure

**xmake test output improvements:**
- Add totals row to test summary table
- Right-justify numeric columns in summary table

1 files changed, 62 insertions, 23 deletions

diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 17e031ba0..bf7b1c853 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -4,6 +4,10 @@ env:
   WINDOWS_SDK_VERSION: 22621
   XMAKE_GLOBALDIR: ${{ github.workspace }}/../.xmake_shared
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref_name != 'main' }}
+
 on:
   pull_request:
     types:
@@ -13,8 +17,11 @@ on:
     branches:
       - 'main'
     paths-ignore:
+      - '*.md'
+      - 'LICENSE'
+      - '.gitignore'
+      - 'docs/**'
       - 'VERSION.txt'
-      - 'CHANGELOG.md'
       - '.github/workflows/create_release.yml'
       - '.github/workflows/mirror_releases.yml'
       - '.github/workflows/mirror.yml'
@@ -22,31 +29,22 @@ on:
     branches:
       - 'main'
     paths-ignore:
+      - '*.md'
+      - 'LICENSE'
+      - '.gitignore'
+      - 'docs/**'
       - 'VERSION.txt'
-      - 'CHANGELOG.md'
       - '.github/workflows/create_release.yml'
       - '.github/workflows/mirror_releases.yml'
       - '.github/workflows/mirror.yml'
 
 jobs:
-  cancel-old-build:
-    name: Cancel previous builds
-    runs-on: [linux, x64, zen]
-
-    steps:
-    - name: Cancel Previous Runs
-      if: ${{ github.ref_name != 'main'}}
-      uses: ue-foundation/[email protected]
-      with:
-        access_token: ${{ github.token }}
-
   clang-format:
-    needs: cancel-old-build
     name: Check clang-format
     runs-on: [linux, x64, zen]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: clang-format
       uses: ue-foundation/clang-format-action@epic-batching-v1
@@ -55,7 +53,6 @@ jobs:
         check-path: 'src'
 
   windows-build:
-    needs: cancel-old-build
     name: Build & Test Windows
     runs-on: [windows, x64, zen]
     timeout-minutes: 25
@@ -69,7 +66,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
+
+    - name: Trust workspace
+      run: git config --global --add safe.directory "${{ github.workspace }}"
 
     - name: Setup xmake
       uses: ue-foundation/[email protected]
@@ -80,6 +80,10 @@ jobs:
       run: |
         xmake config -vD -y -m ${{ matrix.config }} --arch=${{ matrix.arch }} --zensentry=yes
 
+    - name: Clean reports
+      if: ${{ matrix.config == 'debug' }}
+      run: if (Test-Path build/reports) { Remove-Item -Recurse -Force build/reports }
+
     - name: Build & Test
       if: ${{ matrix.config == 'debug' }}
       run: |
@@ -92,9 +96,18 @@ jobs:
         name: reports-win64
         path: build/reports/*.xml
 
+    - name: Test Report
+      if: ${{ (failure() || success()) && (matrix.config == 'debug') }}
+      uses: ue-foundation/test-reporter@v2
+      with:
+        name: Test Results (win64)
+        path: build/reports/*.xml
+        reporter: java-junit
+        list-tests: 'failed'
+
     - name: Bundle
       if: ${{ matrix.config == 'release' }}
-      run: | 
+      run: |
         xmake bundle -v -y --codesignidentity="Epic Games"
 
     - name: Upload zenserver-win64
@@ -105,7 +118,6 @@ jobs:
         path: build/zenserver-win64.zip
 
   linux-build:
-    needs: cancel-old-build
     name: Build & Test Linux
     runs-on: [linux, x64, zen]
     timeout-minutes: 25
@@ -119,7 +131,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Install UE Toolchain
       run: |
@@ -135,6 +147,11 @@ jobs:
       run: |
         ./scripts/ue_build_linux/ue_build.sh ./.tmp-ue-toolchain xmake config -v -y -m ${{ matrix.config }} --arch=${{ matrix.arch }} --zensentry=yes
 
+    - name: Clean reports
+      if: ${{ matrix.config == 'debug' }}
+      shell: bash
+      run: rm -rf build/reports
+
     - name: Build & Test
       if: ${{ matrix.config == 'debug' }}
       run: |
@@ -147,6 +164,15 @@ jobs:
         name: reports-linux
         path: build/reports/*.xml
 
+    - name: Test Report
+      if: ${{ (failure() || success()) && (matrix.config == 'debug') }}
+      uses: ue-foundation/test-reporter@v2
+      with:
+        name: Test Results (linux)
+        path: build/reports/*.xml
+        reporter: java-junit
+        list-tests: 'failed'
+
     - name: Bundle
       if: ${{ matrix.config == 'release' }}
       run: |
@@ -160,7 +186,6 @@ jobs:
         path: build/zenserver-linux.zip
 
   macos-build:
-    needs: cancel-old-build
     name: Build & Test MacOS
     runs-on: [macos, x64, zen]
     timeout-minutes: 25
@@ -174,7 +199,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup xmake
       uses: ue-foundation/[email protected]
@@ -185,6 +210,11 @@ jobs:
       run: |
         xmake config -v -y -m ${{ matrix.config }} --arch=${{ matrix.arch }} --zensentry=yes
 
+    - name: Clean reports
+      if: ${{ matrix.config == 'debug' }}
+      shell: bash
+      run: rm -rf build/reports
+
     - name: Build & Test
       if: ${{ matrix.config == 'debug' }}
       run: |
@@ -197,9 +227,18 @@ jobs:
         name: reports-macos
         path: build/reports/*.xml
 
+    - name: Test Report
+      if: ${{ (failure() || success()) && (matrix.config == 'debug') }}
+      uses: ue-foundation/test-reporter@v2
+      with:
+        name: Test Results (macos)
+        path: build/reports/*.xml
+        reporter: java-junit
+        list-tests: 'failed'
+
     - name: Bundle
       if: ${{ matrix.config == 'release' }}
-      run: | 
+      run: |
         xmake bundle -v -y --codesignidentity="Developer ID Application"
 
     - name: Upload zenserver-macos