APIView - TypeSpec - API review is not generated if PR has more than one project changes

[praveenkuttappan]

API review is generated at TypeSpec project level. API review is not generated if a TypeSpec PR changes more than once project. We have seen swagger PRs that changes more than one RP in same PR. So similar support is required if TypeSpec PR has multi project changes.

Reason: current logic looks for a common parent directory across all modified typespec files and this can lead to non-project parent root directory and API review gen step will fail.

Fix: API review gen step should be run on each project root directory for the modified files and generate API review.