Document DB::Resume(), fix LockWALInEffect test #11290
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Summary: In rare cases seeing failures like this
in a test with no explicit threading. This is likely because of the unpredictability of background auto-resume. I didn't really know this feature, in part because DB::Resume() was undocumented. So I believe I have fixed the test and documented the API function.
Test Plan: 1000s of stress runs of the test with gtest-parallel