Merge changes I319ac82d,I6cc9d6d9,I6be5e43e,I4d7f779b,I83a8cb5b, ... into main

* changes:
  ErrorProne: Enforce & fix EmptyBlockTag
  ErrorProne: Enforce & fix NonCanonicalType
  ErrorProne: Enforce & fix InvalidParam
  ErrorProne: Enforce & fix ReturnAtTheEndOfVoidFunction
  ErrorProne: Enforce & fix MockNotUsedInProduction
  ErrorProne: Enforce & fix FutureReturnValueIgnored
  ErrorProne: Enforce & fix InlineMeInliner
  ErrorProne: Enforce & fix InvalidBlockTag
  ErrorProne: Enforce & fix BadImport
  ErrorProne: Enforce & fix ClassCanBeStatic
  ErrorProne: Enforce & fix StringCharset