Enable ci_build_tags_limit by default

This commit prevents pipeline creation for jobs with more than
50 tags.

Changelog: added

config/feature_flags/development/ci_build_tags_limit.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/338929
 milestone: '14.2'
 type: development
 group: group::pipeline execution
-default_enabled: false
+default_enabled: true

doc/ci/yaml/index.md

@@ -1827,6 +1827,11 @@ rspec:
 
 ### `tags`
 
+> - A limit of 50 tags per job [enabled on GitLab.com](https://gitlab.com/gitlab-org/gitlab/-/issues/338929) in GitLab 14.3.
+> - A limit of 50 tags per job [enabled on self-managed](https://gitlab.com/gitlab-org/gitlab/-/issues/339855) in GitLab 14.3.
+
+In [GitLab 14.3](https://gitlab.com/gitlab-org/gitlab/-/issues/338479) and later, the number of tags must be less than `50`.
+
 Use `tags` to select a specific runner from the list of all runners that are
 available for the project.
 
@@ -1880,9 +1885,6 @@ variables:
       - echo "Hello runner selector feature"
 ```
 
-NOTE:
-In [GitLab 14.3 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/338479), the number of tags must be less than `50`.
-
 ### `allow_failure`
 
 Use `allow_failure` when you want to let a job fail without impacting the rest of the CI