Revert "Add test runner request action"

This reverts commit 26f219da1d.

.github/workflows/request_test_runner.yml

@@ -1,23 +0,0 @@
-name: Request Test Runner
-on: 
-  workflow_dispatch:
-    inputs:
-      run_id:
-        required: true
-        type: string
-      litestream_version:
-        required: true
-        type: string
-
-jobs:
-  build:
-    runs-on: ubuntu-18.04
-    environment: 
-      name: test
-      url: http://litestream-test-runner-${{ github.sha }}.fly.dev
-    steps:
-      - name: Dispatch test runner
-        run: gh workflow run deploy.yml -R benbjohnson/litestream-test-runner -f run_id=${{ github.event.inputs.run_id }} -f litestream_version=${{ github.event.inputs.litestream_version }}
-        env:
-          GITHUB_TOKEN: ${{ secrets.PAT_TOKEN }}
-