Merge branch '521011-update-change-type-modal-to-account-for-milestone-change' into 'master'

Update Change Type Modal to account for Milestone change

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183883



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Jack Chapman <jachapman@gitlab.com>
Approved-by: Nick Brandt <nbrandt@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Jack Chapman <jachapman@gitlab.com>
Co-authored-by: Anastasia Khomchenko <akhomchenko@gitlab.com>