Remove copycat action (#15172)

.github/workflows/on-issue-open.yml

@@ -1,24 +0,0 @@
-name: On Issue Open
-on:
-  issues:
-    types: [opened]
-
-jobs:
-  main:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Actions
-        uses: actions/checkout@v2.2.0
-        with:
-          repository: 'microsoft/azuredatastudio'
-          ref: main
-          path: ./actions
-      - name: Install Actions
-        run: npm install --production --prefix ./actions/build/actions
-
-      - name: Run CopyCat
-        uses: ./actions/build/actions/copycat
-        with:
-          token: ${{secrets.TRIAGE_PAT}}
-          owner: anthonydresser
-          repo: testissues