Optimize cm repo clone by using shallow clone with depth=1 (#436)

Add fetch-depth: 1 to cm repo and cm org checkout steps to only fetch the last commit without history, improving clone performance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: MishaKav

action.yml

@@ -147,6 +147,7 @@ runs:
         repository: '${{ fromJSON(fromJSON(inputs.client_payload)).owner }}/${{ fromJSON(fromJSON(inputs.client_payload)).cmRepo }}'
         ref: ${{ fromJSON(fromJSON(inputs.client_payload)).cmRepoRef }}
         path: gitstream/cm/
+        fetch-depth: 1
 
     - name: Checkout cm org
       uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
@@ -155,6 +156,7 @@ runs:
         repository: 'cm/cm'
         ref: ${{ fromJSON(fromJSON(inputs.client_payload)).cmOrgRef }}
         path: gitstream/cm/
+        fetch-depth: 1
 
     - name: Volume folder
       shell: bash