Enable related issues in EnforcePermissionDetectorTest

Enable ISSUE_ENFORCE_PERMISSION_HELPER and
ISSUE_MISSING_ENFORCE_PERMISSION on EnforcePermissionDetectorTest.
Update the Stub to avoid false negatives (and better reflect AIDL
generated code). This is a no-op to confirm that issues do not
negatively impact each other.

Bug: 307433823
Test: atest --host AndroidGlobalLintCheckerTest
Change-Id: I9ab2b654932a6d228a2a646e5b1fa9c5fc16db02