Delete build-chat.yml

Extra slack noise from community PR's not helpful, we get notifications for Azure CI failures anyways.

.github/workflows/build-chat.yml

@@ -1,36 +0,0 @@
-name: "Build Chat"
-
-on:
-  workflow_run:
-    workflows:
-      - CI
-    types:
-      - completed
-    branches:
-      - main
-      - release/*
-
-jobs:
-  main:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Actions
-        uses: actions/checkout@v2
-        with:
-          repository: "microsoft/vscode-github-triage-actions"
-          path: ./actions
-          ref: stable
-      - name: Install Actions
-        run: npm install --production --prefix ./actions
-      - name: Install Additional Dependencies
-        # Pulls in a bunch of other packages that arent needed for the rest of the actions
-        run: npm install @azure/storage-blob@12.1.1
-      - name: Build Chat
-        uses: ./actions/build-chat
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          slack_token: ${{ secrets.SLACK_TOKEN }}
-          storage_connection_string: ${{ secrets.BUILD_CHAT_STORAGE_CONNECTION_STRING }}
-          workflow_run_url: ${{ github.event.workflow_run.url }}
-          notification_channel: build
-          log_channel: bot-log