Admin: Fix claude-issue-labeler.yml — codeowner notification firing on Admin Support tracking issues

[hilram7]

Admin maintenance fix: claude-issue-labeler.yml Step 4 was incorrectly applying product labels and notifying codeowner teams on Admin Support PR review tracking issues (e.g., issue #1035 for PR #1034).

Identified root cause and implemented fix — added early-exit guard in Step 4 when issue title matches ^Admin: PR review, mirroring the existing kb/review early-exit pattern (data-export-staging #49).

Fix PR: #1037
Automation tracking: #1036