[CI] Trim wasteful and risky workflows (#8483)

Author: TomasVotruba

.github/workflows/benchmark_phpunit.yaml

@@ -2,8 +2,8 @@ name: Tests (Windows)
 
 on:
     schedule:
-        # every 3 hours
-        - cron: '0 */3 * * *'
+        # every 6 hours
+        - cron: '0 */6 * * *'
     workflow_dispatch: null
 
 

.github/workflows/poll_siblings_rebuild.yaml

@@ -52,20 +52,10 @@ jobs:
             -
                 name: Create pull-request
                 uses: peter-evans/create-pull-request@v8
-                id: cpr
                 with:
                     token: ${{ secrets.ACCESS_TOKEN }}
                     commit-message: "[automated] ${{ matrix.actions.name }}"
                     base: 'main'
                     branch: ${{ matrix.actions.branch }}
                     title: '[automated] ${{ matrix.actions.name }}'
                     delete-branch: true
-
-            -
-                name: Enable Pull Request Automerge
-                if: steps.cpr.outputs.pull-request-operation == 'created'
-                uses: peter-evans/enable-pull-request-automerge@v3
-                with:
-                    token: ${{ secrets.ACCESS_TOKEN }}
-                    pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
-                    merge-method: squash