Tests

Initial implementation of DO-attached containers API #11300

Job	Run time
fixup / block-fixup	6s
labels / InternalPRRequired	1s
lint / bazel	7m 56s
test (linux, ubuntu-22.04) / bazel	7m 19s
test (linux, ubuntu-22.04, -debug) / bazel	8m 18s
test (macOS, macos-15) / bazel	5m 35s
test (windows, windows-2025) / bazel	19m 58s
test (linux, ubuntu-22.04, -asan) / bazel	12m 17s
	1h 1m 30s

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