Limit automated issue closure to bug issues only (invoke-ai#8776)

* Initial plan

* Add only-labels parameter to limit automated issue closure to bugs only

Co-authored-by: lstein <111189+lstein@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lstein <111189+lstein@users.noreply.github.com>

Author: Copilot

.github/workflows/close-inactive-issues.yml

@@ -23,6 +23,7 @@ jobs:
           close-issue-message: "Due to inactivity, this issue was automatically closed. If you are still experiencing the issue, please recreate the issue."
           days-before-pr-stale: -1
           days-before-pr-close: -1
+          only-labels: "bug"
           exempt-issue-labels: "Active Issue"
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           operations-per-run: 500