Remove external shell script support

[ghost]

Using external scripts increase complexity and may introduce security holes in the system.

Remove script files support and define script body in the command configuration files.

Replace below block

exec: 
    - scripts/release/cut-release-branch.sh

with

exec: 
    - script: |
        git push --dry-run 
  
        deleteRepo
        
        jq  --null-input \
            --arg status "$STATUS" \
            --arg branch "$BRANCH_DEST" \
            --arg branch_mobile "$BRANCH_DEST_MOBILE" \
            --arg version "$SEMVER_RELEASE" \
            '{"status": $status, "data": { "SEMVER_RELEASE": $version,"BRANCH_DEST": $branch,"BRANCH_DEST_MOBILE": $branch_mobile }}'