Merge branch 'enhanced-issue-analytics-fix-chart-x-axis-title' into 'master'

Fix months count in Enhanced Issue Analytics chart x-axis title

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136901



Merged-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Approved-by: Alex Pennells <apennells@gitlab.com>
Reviewed-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Reviewed-by: Alex Pennells <apennells@gitlab.com>
Co-authored-by: Rudy Crespo <rcrespo@gitlab.com>