fix(ci): do not delete instances from `main` branch on merge (#4206)

* fix(ci): do not delete instances from `main` branch on merge

* fix(ci): do not delete instances on merge

This was creating an unintended behavior, and so far instances are being cleaned up in its corresponding workflow.

.github/workflows/clean.yml

@@ -1,42 +0,0 @@
-name: Clean
-
-on:
-  workflow_dispatch:
-  pull_request:
-    branches:
-      - main
-    types: [closed]
-
-env:
-  NETWORK: Mainnet
-  PROJECT_ID: zealous-zebra
-  REGION: us-central1
-  ZONE: us-central1-a
-
-jobs:
-  delete:
-    name: Delete test deployments
-    runs-on: ubuntu-latest
-    permissions:
-      contents: 'read'
-      id-token: 'write'
-    steps:
-      - name: Inject slug/short variables
-        uses: rlespinasse/github-slug-action@v4
-        with:
-          short-length: 7
-
-      # Setup gcloud CLI
-      - name: Authenticate to Google Cloud
-        id: auth
-        uses: google-github-actions/auth@v0.7.1
-        with:
-          workload_identity_provider: 'projects/143793276228/locations/global/workloadIdentityPools/github-actions/providers/github-oidc'
-          service_account: 'github-service-account@zealous-zebra.iam.gserviceaccount.com'
-          token_format: 'access_token'
-
-      - name: Delete test instance
-        continue-on-error: true
-        run: |
-          TEST_INSTANCES=$(gcloud compute instances list --filter="${{ env.GITHUB_REF_SLUG_URL }}" --format='value(NAME)')
-          for instance in ${TEST_INSTANCES}; do gcloud compute instances delete $instance --zone "${{ env.ZONE }}" --delete-disks all --quiet; done