Merge maintenance jobs and add comprehensive logging

[Copilot]

Consolidates expired issue and discussion cleanup into a single job and adds detailed logging for better observability.

Changes

Job Consolidation

• Merged close-expired-discussions and close-expired-issues into single close-expired-entities job
• Combined permissions: discussions: write + issues: write
• Eliminated redundant checkout and setup steps

Logging Enhancements in close_older_issues.cjs

Added core.info logging throughout:

• Search phase: Parameters, query construction, filter statistics
• Filtering phase: Per-issue exclusion reasons with counts
• Execution phase: Progress indicators, comment lengths, API call results
• Summary: Final statistics with visual separators

Example logging output:

core.info(`Starting search for older issues in ${owner}/${repo}`);
core.info(`  Title prefix: ${titlePrefix || "(none)"}`);
core.info(`  Labels: ${labels && labels.length > 0 ? labels.join(", ") : "(none)"}`);
// ...
core.info(`[${i + 1}/${issuesToClose.length}] Processing issue #${issue.number}`);

The logging provides clear visibility into search criteria, filtering decisions, and operation progress without overwhelming the output.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Agentic Maintenance improvements</issue_title>
<issue_description>- merge close issues and close discussions in same job

• add extensive logging in close issues script using core.info</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Agentic Maintenance improvements #11039

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.