* Fix sql script name conflict
There are two V11__ files due to concurrent merge. Renamed one
to V12__
Also removed a @NotNull annotation, which is the fist in the code base.
Most of the code base use @Nullable instead. If we do want to use
@NotNull, we may want to use the javax one instead.
* Run cross-release SQL integration tests
Run SQL integration tests across arbitrary schema and server
releases.
Refer to integration/README.md in this change for more information.
TESTED=Cloud build changes tested with cloud-build-local
Used the published jars to test sqlIntegration task locally.