gh-149321: Remove lazy_imports=none startup mode (#149389) #3098

Job	Run time
aarch64-unknown-linux-gnu/gcc	7m 3s
x86_64-unknown-linux-gnu/gcc	10m 23s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 23s
aarch64-apple-darwin/clang	9m 8s
x86_64-apple-darwin/clang	14m 16s
	48m 13s

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