fix: helpers.git.checkout_branch from_branch functionality

I used to query by default the repo.active_branch.name which will work only if you clone the repo for the first time. But consequitive runs will not. This ensures to query the default branch name from the SCM provider.

app/helpers/git.py

@@ -227,7 +227,7 @@ def checkout_branch(repo: Repo, branch_name: str, from_branch: str = None, remot
             branch.set_tracking_branch(repo.refs[remote_branch_name])
         else:
             _logger.info(f"'{branch_name}' doesn't exist, creating..")
-            from_branch = from_branch or repo.active_branch.name
+            from_branch = from_branch or get_default_branch_name(repo=repo, remote_name=remote_name)
             remote_from_branch = f"{remote_name}/{from_branch}"
             if from_branch in repo.branches:
                 branch = repo.create_head(branch_name, commit=from_branch)