chore(ci): avoid IT setup if suite will not run (#23259)

* chore(ci): avoid IT setup if suite will not run

* test - trigger

* cannot access 'secrets' in if, add env block

* trigger tests

* turns out we do NEED the step

* Revert "trigger tests"

This reverts commit 53b6fd7.

* revert trigger

Author: pront

.github/workflows/integration.yml

@@ -87,10 +87,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - run: sudo npm -g install @datadog/datadog-ci
-      - run: sudo -E bash scripts/ci-free-disk-space.sh
-      - run: docker image prune -af ; docker container prune -f
-
       - name: Determine if secrets are defined (PR author is team member)
         id: secret_access_check
         if: github.event_name == 'pull_request'
@@ -103,6 +99,13 @@ jobs:
             echo "can_access_secrets=false" >> $GITHUB_OUTPUT
           fi
 
+      - name: Run setup steps required by the IT suite
+        if: ${{ github.event_name == 'merge_group' || steps.check.outputs.can_access_secrets == 'true' }}
+        run: |
+          sudo npm -g install @datadog/datadog-ci
+          sudo -E bash scripts/ci-free-disk-space.sh
+          docker image prune -af && docker container prune -f
+
   integration-tests:
     runs-on: ubuntu-24.04
     needs: