Sync upstream coverage changes - #795
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hermetic-llvm 0.8.14 enables the cc_toolchain coverage features and declares gcov / llvm-cov / llvm-profdata as toolchain files (hermeticbuild/hermetic-llvm #675, fixed by #677), so instrumentation, tool staging into the test sandbox and LLVM_COV/LLVM_PROFDATA all come from the toolchain. Remove the hand-rolled instrumentation copts/linkopts, the two --test_env paths that hardcoded the LLVM release (they broke on every module bump) and --strategy=TestRunner=local: coverage tests run sandboxed again. Add --noexperimental_fetch_all_coverage_outputs to work around a rules_cc bug (dangling `gcov` symlink in each test's raw _coverage tree in llvm mode); drop it once rules_cc >= 0.2.23 (bazelbuild/rules_cc#795) is released. 0.8.14 still pins LLVM 22.1.8, so the compiler is unchanged. Verified: `bazelisk coverage --config=coverage -- //src/utl/test:cpp_tests` passes 4/4 sandboxed, combined lcov report has 1464 DA: lines across 57 files (all under src/), genhtml renders 39.6% lines / 44.2% functions -- identical to the numbers from the original coverage config. `bazelisk build //:openroad` succeeds. Signed-off-by: SombraSoft <sombrio@sombrasoft.dev>
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Fixes #786
Pulls in bazelbuild/bazel#29109 and bazelbuild/bazel#29091