[java] Fix #7275: Handle bare blocks in AvoidBranchingStatementAsLastInLoop - #7283

Describe the PR

Walk through consecutive bare blocks when checking the enclosing loop in AvoidBranchingStatementAsLastInLoop, preserving the existing finally handling and loop-type properties.

Add five regression cases covering nested returns, loop/branch kinds, boundaries, disabled properties, and finally blocks.

Related issues

• Fixes [java] AvoidBranchingStatementAsLastInLoop: False negative when the statement is in a bare block #7275

Validation

• git diff --check and XML parsing pass.
• Independently compiled the original and patched rule against the published PMD 7.29.0 engine and ran all 25 XML cases with their properties and expected line numbers: original rule has three failing new cases; patched rule passes 25/25 with no processing/configuration errors. This is a standalone engine check, not the main-branch JUnit suite.
• The targeted Maven reactor build stops before rule tests because the available runtime lacks the platform signatures for --release 8. Native tests and the complete build remain for CI.

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build ./mvnw clean verify passes (checked automatically by github actions)
• Added (in-code) documentation (if needed)