Linbee 17477 gitstream failing due to an error with multiple remote branches (#321)

* fix: update checkout command to use upstream reference for head branch

* fix: correct checkout command to use proper syntax for upstream reference

* fix: streamline checkout process by removing redundant commands

* fix: update checkout commands to correctly reference base and head branches

* fix: remove redundant checkout commands for base and head branches

* fix: enhance checkout process by configuring default remote and ensuring proper branch checkouts

Author: MishaKav

action.yml

@@ -132,6 +132,7 @@ runs:
       run: |
         ALL=2147483647
         cd gitstream && cd repo
+        git config checkout.defaultRemote origin
         git fetch --deepen=$ALL origin $'${{ steps.safe-strings.outputs.base_ref }}'
         git remote add upstream $'${{ steps.safe-strings.outputs.url }}'
         git fetch --deepen=$ALL upstream $'${{ steps.safe-strings.outputs.head_ref }}'