Fix formatting of date for clear status on super sidebar

What does this MR do and why?

• Fixes issue with super sidebar for editing user status for Firefox/Safari.
• DRYs up the fetching of the user status
• Fixes the AR relationship inference and then fixes the tests to reset the relation since delete is used in blanking the status

note: no changelog since super sidebar is behind a feature flag

Screenshots or screen recordings

on firefox

before	after

How to set up and validate locally

1. Enable the invite modal

   Feature.enable(:super_sidebar_nav)

2. Enable New navigation toggle under the user dropdown.
3. Set user status in chrome with a clear after date.
4. Switch to Firefox.
5. Go to edit the previously set user status.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #392870 (closed)