Avoid duplicate user-local-time

[fregante]

• Closes Duplicate on user-local-time (official feature now) #6013

Test URLs

• Right here, hover this: @Katsute

Screenshot

[fregante]

The feature has a lot of awkward logic due to the hovercard behavior. It can probably be avoided with some tactical CSS that adds the required padding automatically to all user hovercards so that the initial calculation by GitHub takes it into account. Example:

.Popover-message:has([aria-label="user avatar"]):not(:has(.octicon)) {
  padding-bottom: 26px;
}

Plus now better selectors are available thanks to the aria-label attributes. The feature would look like:

observe('user Details Container without time', container => {
  if (cached time is `false`) {
    return
  }
  const user = container.user ?? globalUser
  container.append(<DynamicUserTime {user}>)
})

[fregante]

@kidonng I reverted #5779 because the temporary duplicate code ended up being permanent and the feature was unmaintainable as is.