Add test summary table and failure reporting to xmake test (#794)

- Add a summary table printed after all test suites complete, showing per-suite test case counts, assertion counts, timings and pass/fail status.
- Add failure reporting: individual failing test cases are listed at the end with their file path and line number for easy navigation.
- Made zenserver instances spawned by a hub not create new console windows for a better background testing experience
- The TestListener in testing.cpp now writes a machine-readable summary file (via `ZEN_TEST_SUMMARY_FILE` env var) containing aggregate counts and per-test-case failure details. This runs as a doctest listener alongside any active reporter, so it works with both console and JUnit modes.
- Tests now run in a deterministic order defined by a single ordered list that also serves as the test name/target mapping, replacing the previous unordered table + separate order list.
- The `--run` option now accepts comma-separated values  (e.g. `--run=core,http,util`) and validates each name, reporting unknown test names early.
- Fix platform detection in `xmake test`: the config command now passes `-p` explicitly, fixing "mingw" misdetection when running from Git Bash on Windows.
- Add missing "util" entry to the help text for `--run`.

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