Remove issue response action (#39200)

This action has consistently failed to run for many months on end, so we
haven't been relying on it.

Release Notes:

- N/A

.github/workflows/issue_response.yml

@@ -1,33 +0,0 @@
-name: Issue Response
-
-on:
-  schedule:
-    - cron: "0 12 * * 2"
-  workflow_dispatch:
-
-jobs:
-  issue-response:
-    if: github.repository_owner == 'zed-industries'
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
-
-      - uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
-        with:
-          version: 9
-
-      - name: Setup Node
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: "20"
-          cache: "pnpm"
-          cache-dependency-path: "script/issue_response/pnpm-lock.yaml"
-
-      - run: pnpm install --dir script/issue_response
-
-      - name: Run Issue Response
-        run: pnpm run --dir script/issue_response start
-        env:
-          ISSUE_RESPONSE_GITHUB_TOKEN: ${{ secrets.ISSUE_RESPONSE_GITHUB_TOKEN }}
-          SLACK_ISSUE_RESPONSE_WEBHOOK_URL: ${{ secrets.SLACK_ISSUE_RESPONSE_WEBHOOK_URL }}