Get rid of .clang-tidy in tests directory #4483

Job	Run time
pre-commit / check-file-sizes	6s
pre-commit / pre-commit	2m 9s
windows / clang-build	2m 9s
windows / msvc-build (Debug)	3m 10s
ubuntu / clang-build (ubuntu-24.04)	2m 46s
windows / msvc-build (Release)	2m 1s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 11s
mac / clang-build (Release)	3m 3s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 18s
mac / clang-build (Debug)	2m 0s
windows / clang-test	3m 11s
ubuntu / gcc-test (ubuntu-24.04)	8m 28s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 13s
ubuntu / clang-test (ubuntu-24.04)	8m 21s
mac / clang-test	5m 53s
windows / msvc-test	4m 53s
windows / clang-test-extended	2m 49s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 57s
windows / msvc-test-extended	3m 6s
mac / clang-test-extended	2m 48s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 22s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 34s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 35s
ubuntu / gcc-build-codecov	7m 30s
perf / macos-clang-build-perf-stats	2m 34s
perf / ubuntu-gcc-build-perf-stats	1m 25s
pages / build-scoreboard	18s
pages / build-doxygen-xml	22s
pages / build-sphinx	36s
pages / deploy-pages	0s
	1h 31m 48s

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