There was a refactoring of AbstractDiagnosticsTest in 9052ef06 which
contains bug that `setupEnvironment` for AbstractDiagnosticsTestUsingJavac
was not called, so for last year tests `UsingJavac` had no difference
with usual diagnostics tests which causes some contradictions in test data
- DeprecatedSinceKotlin annotation should only be applicable when
there's `@Deprecated` annotation on the same declaration
- Deprecation level shouldn't be specified in the relevant
`@Deprecated` annotation
- Check that warningSince <= errorSince <= hiddenSince