Get rid of .clang-tidy in tests directory (#726) #4498

Job	Run time
pre-commit / check-file-sizes	5s
pre-commit / pre-commit	1m 47s
ubuntu / clang-build (ubuntu-24.04)	2m 50s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 20s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 15s
mac / clang-build (Debug)	3m 23s
windows / clang-build	4m 21s
windows / msvc-build (Debug)	3m 17s
mac / clang-build (Release)	2m 53s
windows / msvc-build (Release)	2m 3s
ubuntu / gcc-test (ubuntu-24.04)	8m 38s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 39s
ubuntu / clang-test (ubuntu-24.04)	8m 24s
windows / msvc-test	5m 41s
mac / clang-test	4m 35s
windows / clang-test	3m 0s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 49s
windows / clang-test-extended	3m 21s
mac / clang-test-extended	3m 4s
windows / msvc-test-extended	3m 45s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 39s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 38s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 49s
ubuntu / gcc-build-codecov	7m 41s
perf / macos-clang-build-perf-stats	2m 37s
perf / ubuntu-gcc-build-perf-stats	1m 26s
pages / build-doxygen-xml	19s
pages / build-scoreboard	18s
pages / build-sphinx	43s
pages / deploy-pages	0s
	1h 37m 20s

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