Remove redundant S3 bucket cleanup (#3977)

Now that we're relying on S3 lifecycle policies for bucket cleanup we can remove the script that would remove everything from the bucket on a weekly basis.

---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [x] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Test Plan

- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

.github/workflows/weekly_cleanup.yml

@@ -1,26 +0,0 @@
-name: Weekly S3 Test Bucket Cleanup
-on:
-  schedule:
-    # every saturday at 23:59 (11:59pm)
-    - cron: "59 23 * * 6"
-
-permissions:
-  # required to retrieve AWS credentials
-  id-token: write
-
-jobs:
-  S3-Test-Cleanup:
-    runs-on: ubuntu-latest
-    environment: Testing
-
-    steps:
-      - name: Configure AWS credentials from Test account
-        uses: aws-actions/configure-aws-credentials@v2
-        with:
-          role-to-assume: ${{ secrets.AWS_IAM_ROLE }}
-          role-session-name: integration-testing
-          aws-region: us-east-1
-
-      - name: Delete all files in the test bucket
-        run: |
-          aws s3 rm s3://${{ secrets.CI_TESTS_S3_BUCKET }} --recursive  --include "*" --exclude "longevity/*"