XWIKI-23496: Date facet unexpected layout when enough space

[Sereza7]

Jira URL

https://jira.xwiki.org/browse/XWIKI-23496

Changes

Description

• Added a style to avoid the unexpected layout at very high viewport width.

Clarifications

• By making the width relative to the parent size, we make sure the form will take its own column in the facet display. This way, we avoid having the weird display that was showcased in the issue description.
• It slightly moved the form even in regular conditions, but IMO it's alright and it makes it clearer that the form is under the checkbox in the hierarchy. See the screenshots below

Screenshots & Video

Here are a couple of pairs of screenshots of the impacted UI. I just searched the page string on my default instance and selected the custom date range picker to see this:
Before the PR:
extra large viewport

regular viewport

After the PR:
extra large viewport

regular viewport

Executed Tests

Manual tests, see above.
This is a low impact style only change (low importance on a very limited scope) so I figured it wouldn't have any impact on docker or functional tests.

Expected merging strategy

• Prefers squash: Yes
• Backport on branches:
  • None.