Drop support for bazel5; switch to all bzlmod. #4788

Job	Run time
RunBantBuildCleaner	3m 19s
x86_64 test	6m 46s
MacOsBuild	6m 18s
ClangTidy	14m 42s
arm64 test	6m 42s
PrepareVSPlugin	2m 21s
x86_64 test-clang	6m 43s
arm64 test-clang	6m 41s
VerifyFormatting	24s
x86_64 test-nortti	6m 40s
WindowsBuild	14m 11s
KytheXrefs	0s
x86_64 test-c++20	6m 42s
KytheVerification	0s
x86_64 test-c++23	6m 45s
x86_64 smoke-test	14m 2s
arm64 smoke-test	14m 3s
x86_64 asan	8m 18s
x86_64 asan-clang	7m 11s
x86_64 compile	7m 17s
arm64 compile	5m 59s
x86_64 compile-clang	6m 21s
arm64 compile-clang	6m 27s
x86_64 compile-static	6m 43s
arm64 compile-static	6m 11s
x86_64 compile-static-clang	5m 39s
arm64 compile-static-clang	6m 1s
x86_64 clean	7m 58s
arm64 clean	7m 9s
Build and deploy GitHub pages	0s
📦 Release	1s
	3h 17m 34s

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