Add GitHub Action to auto-close parent issues

[SmartManoj]

What specific problem does this solve?

Avoids this scenario.

How should this be solved?

#3661

How will we know it works? (Acceptance Criteria)

https://github.com/SmartManoj/Roo-Code/actions/runs/15063558027/job/42343266065

Estimated effort and complexity

Technical considerations (optional but helpful)

No response

Trade-offs and risks (optional)

No response

Additional context (optional)

No response

Proposal checklist

• I've searched existing Issues and Discussions for duplicates
• This is a specific, actionable proposal with clear problem and solution
• I've included concrete acceptance criteria
• I understand this needs approval before implementation begins

Interested in implementing this?

• Yes, I'd like to help implement this feature

[hannesrudolph]

We don't group many issues under parent issues and are fine with manually closing them for now.