Always use included script for installing. #4765

Job	Run time
VerifyFormatting	25s
ClangTidy	1h 31m 57s
MacOsBuild	3m 48s
x86_64 test	3m 35s
MacOsBuildDevTools	5m 6s
arm64 test	4m 16s
RunBantBuildCleaner	3m 38s
x86_64 test-clang	3m 53s
arm64 test-clang	4m 31s
x86_64 test-nortti	3m 38s
KytheVerification	0s
KytheXrefs	0s
x86_64 test-c++20	3m 46s
x86_64 test-c++23	3m 18s
PrepareVSPlugin	2m 12s
x86_64 smoke-test	9m 47s
WindowsBuild	42m 34s
arm64 smoke-test	12m 5s
x86_64 asan	5m 9s
x86_64 asan-clang	5m 1s
x86_64 compile	3m 20s
arm64 compile	3m 55s
x86_64 compile-clang	3m 3s
arm64 compile-clang	3m 48s
x86_64 compile-static	3m 38s
arm64 compile-static	3m 41s
x86_64 compile-static-clang	3m 17s
arm64 compile-static-clang	3m 40s
x86_64 coverage	13m 34s
x86_64 clean	6m 14s
arm64 clean	7m 24s
Build and deploy GitHub pages	11s
📦 Release	0s
	4h 24m 24s

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