Draft: Migrate GitLab Operator utilities to ClickHouse operator
This MR vendors the GitLab Operator library and its utilities and adopts them in ClickHouse operator.
The library is moved to /pkg
directory to separate it from the rest of the ClickHouse operator codebase. All test cases are removed for brevity.
Related to #1678 (closed)
Edited by Hossein Pursultani