fix(build): bad report generated by code coverage CLI helper

This commit addresses several issues and improvements in the algorithm and CLI functionality for generating code coverage reports. Specifically, it fixes the method of identifying the development branch artifact by iterating through all dev branch pipelines and validating their git SHA and coverage job availability.
A `--verbose` option has been added to the CLI for detailed output. Furthermore, the codebase has transitioned from using `os.path` to `pathlib.Path`, simplifying path manipulations.
Additionally, it updates the `python-gitlab` library from version 4.10.0 to 5.3.1 in the requirements.