Add workflow run links to agent failure issue footers

[Copilot]

Agent failure tracking issues displayed workflow names as plain text in footers, requiring manual navigation to find the originating run.

Changes

• messages_footer.cjs: Updated getFooterAgentFailureIssueMessage() and getFooterAgentFailureCommentMessage() to render workflow names as markdown links to their run URLs
• handle_agent_failure.test.cjs: Updated test assertions to verify link format

Before/After

Before:

> Generated from Issue Monster

After:

> Generated from [Issue Monster](https://github.com/owner/repo/actions/runs/21240454588)

The runUrl parameter was already being passed to both functions but not utilized in the default template strings.

Original prompt

The footer inserted in issues created when a workflow run fails should include a link to the workflow run. In the attached comment, the footer is plain text generated by the system, but it is missing this link.

#11229 (comment)

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