Reduce unnecessary visibility. #4079

Job	Run time
ClangTidy	1h 26m 9s
KytheXrefs	0s
KytheVerification	8m 52s
x86_64 test	12m 58s
MacOsBuild	29m 30s
MacOsBuildDevTools	7m 26s
arm64 test	11m 56s
Generate Build matrix	3s
x86_64 test-nortti	13m 31s
PrepareVSPlugin	2m 2s
x86_64 test-c++20	15m 34s
VerifyFormatting	1m 39s
WindowsBuild	23m 13s
x86_64 test-c++23	17m 13s
x86_64 smoke-test	14m 36s
arm64 smoke-test	14m 22s
x86_64 smoke-test-analyzer	18m 51s
arm64 smoke-test-analyzer	19m 30s
x86_64 asan	22m 11s
x86_64 asan-clang	17m 13s
x86_64 compile	11m 3s
arm64 compile	6m 50s
x86_64 compile-clang	7m 9s
arm64 compile-clang	7m 5s
x86_64 compile-static	7m 34s
arm64 compile-static	6m 53s
x86_64 compile-static-clang	6m 59s
arm64 compile-static-clang	6m 56s
x86_64 coverage	17m 43s
x86_64 clean	7m 0s
arm64 clean	6m 44s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	9s
📦 Release	0s
	7h 8m 54s

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