Tests

Enable python external package loading by default. #11318

Job	Run time
fixup / block-fixup	5s
labels / InternalPRRequired	1s
lint / bazel	4m 11s
test (linux, ubuntu-22.04) / bazel	11m 1s
test (linux, ubuntu-22.04, -asan) / bazel	7m 22s
test (macOS, macos-15) / bazel	10m 3s
test (linux, ubuntu-22.04, -debug) / bazel	9m 27s
test (windows, windows-2025) / bazel	19m 2s
	1h 1m 12s

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