CNDB-8641: Add metric to ClientRequestMetrics to count InvalidRequestException

[cbornet]

What is the issue

https://github.com/riptano/cndb/issues/8641

What does this PR fix and why was it fixed

This PR introduces a new invalid meter to the ClientRequestMetrics class, update error handling in StorageProxy to record invalid requests, and enhance related unit tests.

[github-actions]

Checklist before you submit for review

• This PR adheres to the Definition of Done
• Make sure there is a PR in the CNDB project updating the Converged Cassandra version
• Use NoSpamLogger for log lines that may appear frequently in the logs
• Verify test results on Butler
• Test coverage for new/modified code is > 80%
• Proper code formatting
• Proper title for each commit staring with the project-issue number, like CNDB-1234
• Each commit has a meaningful description
• Each commit is not very long and contains related changes
• Renames, moves and reformatting are in distinct commits
• All new files should contain the DataStax copyright header instead of the Apache License one

[cbornet]

Closing in favor of #1983