Merge branch '347356-fa-restrict-job-when-string' into 'master'

Fix wrong behavior when CI keyword "when" is an array

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/101350



Merged-by: George Koltsov <gkoltsov@gitlab.com>
Approved-by: Mireya Andres <mandres@gitlab.com>
Approved-by: George Koltsov <gkoltsov@gitlab.com>
Co-authored-by: Furkan Ayhan <furkanayhn@gmail.com>