[DRAFT] When "Use relative time" is unchecked, explore whether repository should show timestamp
# Context
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/192402#note_2523353879
When "Use relative times" is unchecked, the Repository Last update column shows a timestamp in addition to the date. This is visually cluttering the UI, which is already information-dense. Considering users can hover over the time to reveal the timestamp, displaying time may be superfluous.
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# Design question
* Is the timestamp actually providing value?
* Do we have data on what percentage of users have the "Use relative time" preference unchecked?
* Do we have data on how valuable it is to have the timestamp always shown in the "Last update" column?
* One consideration may be that this is slightly more accessible than the timestamp on hover. https://gitlab.com/gitlab-org/gitlab/-/issues/18607#note_2482042561
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