Move lib names to envar (#2952)

Move lib names to envar
---

#### 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

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [x] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* #<issue>

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

.github/workflows/ci_test_cleanup.yml

@@ -30,7 +30,7 @@ jobs:
           user: ${{ secrets[matrix.user] }}
           site: ${{ secrets.CORSO_M365_TEST_SITE_URL}}
           folder-prefix: "Corso_Restore_, TestRestore, testfolder, incrementals_ci_, Alcion_Restore_"
-          libraries: ${{ secrets.CORSO_M365_TEST_SITE_LIBRARIES }}
+          libraries: ${{ env.CORSO_M365_TEST_SITE_LIBRARIES }}
           older-than: ${{ env.HALF_HOUR_AGO }}
           azure-client-id: ${{ secrets.CLIENT_ID }}
           azure-client-secret: ${{ secrets.CLIENT_SECRET }}