fix(ci): collapse Cypress e2e matrix from 2 runners to 1 (#42715)

.github/workflows/bashlib.sh

@@ -256,7 +256,7 @@ cypress-run-all() {
   # UNCOMMENT the next few commands to monitor memory usage
   # monitor_memory &  # Start memory monitoring in the background
   # memoryMonitorPid=$!
-  python ../../scripts/cypress_run.py --parallelism $PARALLELISM --parallelism-id $PARALLEL_ID --group $PARALLEL_ID --retries 5 $USE_DASHBOARD_FLAG
+  python ../../scripts/cypress_run.py --retries 5 $USE_DASHBOARD_FLAG
   # kill $memoryMonitorPid
 }
 

.github/workflows/superset-e2e.yml

@@ -57,19 +57,13 @@ jobs:
       pull-requests: read
     strategy:
       # when one test fails, DO NOT cancel the other
-      # parallel_id, because this will kill Cypress processes
+      # app_root variant, because this will kill Cypress processes
       # leaving the Dashboard hanging ...
       # https://github.com/cypress-io/github-action/issues/48
       fail-fast: false
       matrix:
-        parallel_id: [0, 1]
         browser: ["chrome"]
         app_root: ${{ github.event_name == 'push' && fromJSON('["", "/app/prefix"]') || fromJSON('[""]') }}
-        # The /app/prefix variant (push events only) is smoke-tested on a single
-        # shard rather than the full matrix, so exclude it from the other shards.
-        exclude:
-          - parallel_id: 1
-            app_root: "/app/prefix"
     env:
       SUPERSET_ENV: development
       SUPERSET_CONFIG: tests.integration_tests.superset_test_config
@@ -148,8 +142,6 @@ jobs:
         uses: ./.github/actions/cached-dependencies
         env:
           CYPRESS_BROWSER: ${{ matrix.browser }}
-          PARALLEL_ID: ${{ matrix.parallel_id }}
-          PARALLELISM: 2
           CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}
           NODE_OPTIONS: "--max-old-space-size=4096"
         with:
@@ -167,7 +159,7 @@ jobs:
         if: failure()
         with:
           path: ${{ github.workspace }}/superset-frontend/cypress-base/cypress/screenshots
-          name: cypress-artifact-${{ github.run_id }}-${{ github.job }}-${{ matrix.browser }}-${{ matrix.parallel_id }}--${{ steps.set-safe-app-root.outputs.safe_app_root }}
+          name: cypress-artifact-${{ github.run_id }}-${{ github.job }}-${{ matrix.browser }}--${{ steps.set-safe-app-root.outputs.safe_app_root }}
 
   playwright-tests:
     needs: changes