fix: triage misplaced game submissions and handle manual Submission label - #4259

When submitters place game files outside the games/ directory (such as in the repository root or uppercase Games/), the auto-triage workflow previously skipped execution with 'Not a submission PR', because it strictly checked filename.startsWith('games/') and the new PR lacked the Submission label. The bot never commented to inform the submitter where the file belonged.

Furthermore, when a maintainer manually added the Submission label, the workflow did not trigger because labeled was not included in the workflow event types.

This change:

• Adds labeled to pull_request_target types in auto-triage.yml, ignoring events where the added label is not Submission.
• Checks games/ case-insensitively.
• Recognizes game submissions by PR body template so misplaced files trigger triage, report the placement error, and provide the edit link.