Remove non-existent unload event handler from webagg image object - #32402

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target

Unexpected input(s) 'label-automated', valid inputs are ['github-token', 'allowed-users', 'trusted-author-associations', 'scan-pull-requests', 'scan-issues', 'mode', 'comment-on-organic', 'cache-path', 'label-community-flagged', 'label-mixed', 'label-automation', 'auto-close', 'auto-close-classifications', 'message-organic', 'message-mixed', 'message-automation', 'message-community-flagged', 'honeypot', 'message-honeypot', 'message-honeypot-first-time']