Fix reference to test site ID (#4223)

Pull site ID from environment not secrets

---

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


#### Test Plan

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

.github/workflows/sanity-test.yaml

@@ -336,7 +336,7 @@ jobs:
           suffix=$(date +"%Y-%m-%d_%H-%M-%S")
 
           go run . sharepoint files  \
-            --site ${{ secrets.CORSO_M365_TEST_GROUPS_SITE_URL }} \
+            --site ${{ vars.CORSO_M365_TEST_GROUPS_SITE_URL }} \
             --user ${{ env.TEST_USER }} \
             --secondaryuser  ${{ env.CORSO_SECONDARY_M365_TEST_USER_ID }} \
             --tenant ${{ secrets.TENANT_ID }} \
@@ -351,7 +351,7 @@ jobs:
         with:
           service: groups
           kind: initial
-          backup-args: '--group "${{ secrets.CORSO_M365_TEST_TEAM_ID }}"'
+          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}"'
           test-folder: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}'
           log-dir: ${{ env.CORSO_LOG_DIR }}
 
@@ -361,7 +361,7 @@ jobs:
         with:
           service: teams
           kind: initial
-          backup-args: '--group "${{ secrets.CORSO_M365_TEST_TEAM_ID }}"'
+          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}"'
           test-folder: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}'
           log-dir: ${{ env.CORSO_LOG_DIR }}