delete pr-chat action

.github/workflows/pr-chat.yml

@@ -1,25 +0,0 @@
-name: PR Chat
-on:
-  pull_request_target:
-    types: [opened, ready_for_review, closed]
-
-jobs:
-  main:
-    runs-on: ubuntu-latest
-    if: ${{ !github.event.pull_request.draft }}
-    steps:
-      - name: Checkout Actions
-        uses: actions/checkout@v2
-        with:
-          repository: "microsoft/vscode-github-triage-actions"
-          ref: stable
-          path: ./actions
-      - name: Install Actions
-        run: npm install --production --prefix ./actions
-      - name: Run Code Review Chat
-        uses: ./actions/code-review-chat
-        with:
-          token: ${{secrets.GITHUB_TOKEN}}
-          slack_token: ${{ secrets.SLACK_TOKEN }}
-          slack_bot_name: "VSCodeBot"
-          notification_channel: codereview