chore: Remove issue pr management workflow

.github/workflows/issue_pr_management.yaml

@@ -1,27 +0,0 @@
-name: Close Inactive Issues And PRs
-on:
-  schedule:
-    - cron: "30 1 * * *"
-
-jobs:
-  close-issues:
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
-    steps:
-      - uses: actions/stale@v9
-        with:
-          days-before-issue-stale: 120
-          days-before-issue-close: 14
-          stale-issue-label: "stale"
-          stale-issue-message: "This issue is stale because it has been open for 120 days with no activity."
-          close-issue-message: "This issue was closed because it has been inactive for 14 days since being marked as stale."
-          stale-pr-message: "This pull request is stale because it has been open for 120 days with no activity."
-          close-pr-message: "This pull request was closed because it has been inactive for 14 days since being marked as stale."
-          days-before-pr-stale: 120
-          days-before-pr-close: 14
-          exempt-milestones: true
-          exempt-assignees: krille-chan
-          operations-per-run: 500
-          repo-token: ${{ secrets.GITHUB_TOKEN }}