ci: update report workflow for copilot assignment and content

[joshblack]

Update our workflow for reporting workflow failures to:

• Assign copilot to the issue (hopefully)
• Update the content of the issue to be more descriptive
• Set the issue type as a bug
• Set the issue label to include area: actions

[Copilot]

Pull request overview

Updates the report-workflow-failures GitHub Actions workflow that files/updates an issue when a monitored workflow run fails, aiming to improve triage by enriching issue content, labeling, and attempting Copilot agent assignment.

Changes:

• Adds a descriptive “Generated by …” line and an “Agent instructions” details section to the created/updated issue body.
• Applies the area: actions label and attempts to set the issue type to Bug.
• Captures the created/updated issue number and adds a follow-up step to assign copilot-swe-agent[bot] via gh api.

Show a summary per file

File	Description
.github/workflows/report-workflow-failures.yml	Enhances issue content, adds labeling/type, and introduces a Copilot assignment step using gh api.

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