Add support to topics on Gitlab Project module (#6278)
* add topics to gitlab_project.py
* add chngelog fragment
* fix lint error
* Update changelogs/fragments/6277-add-topics-gitlab-project.yml
Co-authored-by: Felix Fontein <felix@fontein.de>
* Apply suggestions from code review
Co-authored-by: Felix Fontein <felix@fontein.de>
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Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit cee5f31b70)
Co-authored-by: Lorenzo Tanganelli <35271287+tanganellilore@users.noreply.github.com>
