feat(branch removal trough UI): Added delete_branch method for git. Fixes: RCCE-75

vcsserver/remote/git_remote.py

@@ -551,6 +551,13 b' class GitRemote(RemoteBase):'
         return _branch(context_uid, repo_id, commit_id)
 
     @reraise_safe_exceptions
+    def delete_branch(self, wire, branch_name):
+        repo_init = self._factory.repo_libgit2(wire)
+        with repo_init as repo:
+            if branch := repo.lookup_branch(branch_name):
+                branch.delete()
+
+    @reraise_safe_exceptions
     def commit_branches(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)