[BUG] code-quality-report CI is detecting checkstyle violations not picked by core-v2 library CI

Seems there is currently no fromSource run for v2 libraries.
https://github.com/Azure/azure-sdk-for-java/pull/45295

However, we have that for code-quality-report CI. It will check all `io.clientcore` dependents, which will include all v2 libraries:
https://github.com/Azure/azure-sdk-for-java/pull/45387/checks?check_run_id=42458413428

code-quality-report CI then would fail for checkstyle violations for v2 libraries that haven't been detected previously PR's CI.

How should we deal with this?

Potential candidate:
1. Add suppression for v2 libraries in [checkstyle-suppressions.xml](https://github.com/Azure/azure-sdk-for-java/blob/main/eng/code-quality-reports/src/main/resources/checkstyle/checkstyle-suppressions.xml).