gh-149321: Remove lazy_imports=none startup mode #3042

Job	Run time
x86_64-apple-darwin/clang	18m 38s
aarch64-unknown-linux-gnu/gcc	7m 15s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 0s
aarch64-apple-darwin/clang	9m 1s
x86_64-unknown-linux-gnu/gcc	10m 9s
	53m 3s

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