ci: Remove pushing to main as part of the release process (#1274)

Author: rmi22186

.github/workflows/staging-step-3.yml

@@ -26,15 +26,13 @@ jobs:
         - name: Push release commits to development
           run: |
             git push origin HEAD:development
-        
-        # We will eventually replace master with main
-        - name: Push release commits to main and master
+
+        - name: Push release commits to master
           run: |
             git push origin HEAD:master
-            git push origin HEAD:main
 
         - name: Push release commits to Release Order Branches
           run: |
             git push origin HEAD:release-order-a
             git push origin HEAD:release-order-b
-            git push origin HEAD:release-order-c
+            git push origin HEAD:release-order-c