[1.0.x] Build: Apply spotless on integration modules as well

[nastra]

Command needs to be executed with JDK 8: ./gradlew spotlessApply -DflinkVersions=1.13,1.14,1.15 -DsparkVersions=2.4,3.0,3.1,3.2,3.3 -DhiveVersions=2,3 --no-build-cache