[stable-8] New module: gitlab_label (#7657) (#7900)

New module: gitlab_label (#7657)

* gitlab project label first commit

* fixes from CI run

* fixing some sanity test

* sanity checks, removing typing

* remove default for required field

* fix indentation

* improving test set

* fixes to pass test set

* reuse compliancy

* fix sanity checks

* fix: method returns group, not project

* refactor: start adding group, test still pass

* updated module and tests to handle group labels

* update name to remove 'project'

* removing default

* typo

* generic name for returned dict

* returns also label object from library invocation

* remove unused var, updated doc

* fix output object name

* version_added

Co-authored-by: Felix Fontein <felix@fontein.de>

* Remove python 2.7

Co-authored-by: Felix Fontein <felix@fontein.de>

* Missing dot

Co-authored-by: Felix Fontein <felix@fontein.de>

* Remove version_added

Co-authored-by: Felix Fontein <felix@fontein.de>

* Remove useless doc

Co-authored-by: Felix Fontein <felix@fontein.de>

* Color is a string

* Fixes from recent PR comments.

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 5c72ab34bf)

Co-authored-by: Gabriele Pongelli <gpongelli@users.noreply.github.com>

.github/BOTMETA.yml

@@ -562,6 +562,8 @@ files:
     maintainers: paytroff
   $modules/gitlab_issue.py:
     maintainers: zvaraondrej
+  $modules/gitlab_label.py:
+    maintainers: gpongelli
   $modules/gitlab_merge_request.py:
     maintainers: zvaraondrej
   $modules/gitlab_project_variable.py: