Show current time in time format preference labels
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=431232) </details> <!--IssueSummary end--> Follow up from https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130789#note_1639301924 ### Current We show static examples of time formats in preferences ### Proposal Show the user's current time in each option. For example, if it's 2:48PM my time (and my system preferences are set to 12h format), I'd see the following: ![Screenshot_2023-11-08_at_8.37.37_AM](/uploads/ed8a9bf15ccbb9e63ff7929699584d87/Screenshot_2023-11-08_at_8.37.37_AM.png)
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