Prevent the static purge scripts running in combination without a user (#2832)

---

#### 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

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

#### Issue(s)

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* #<issue>

#### Test Plan

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

.github/actions/purge-m365-user-data/action.yml

@@ -27,7 +27,11 @@ inputs:
     description: Secret value of for AZURE_CLIENT_SECRET
   azure-tenant-id:
     description: Secret value of for AZURE_TENANT_ID
-    
+  m365-admin-user:
+    description: Secret value of for M365TENANT_ADMIN_USER
+  m365-admin-password:
+    description: Secret value of for M365TENANT_ADMIN_PASSWORD
+
 runs:
   using: composite
   steps:
@@ -54,7 +58,7 @@ runs:
         ./setRetention.ps1
 
     - name: Run the static purge script set
-      if: ${{ inputs.folder-prefix == '' }}
+      if: ${{ inputs.folder-prefix == '' && inputs.user != '' }}
       shell: pwsh
       working-directory: ./src/cmd/purge/scripts
       env: