Support time entries in FlatpickrDateBef filter plugin

This will need more testing, but I got a first working version.

It has an issue where on first setup it throws an error, but then if the view is saved it works fine afterwards. Not sure why it does that.

I did not test it with min-max (2 date filter) yet, but tests run fine.

It works with is between now too.

I leave it as needs work, because of the issue when enabling the plugin the first time.

  - Syncing drupal/datetime_flatpickr (dev-3.0.x 9798387) into cache
Gathering patches for root package.
Gathering patches for dependencies. This might take a minute.
  - Installing drupal/datetime_flatpickr (dev-3.0.x 9798387): Cloning 9798387fdf from cache
  - Applying patches for drupal/datetime_flatpickr
    https://www.drupal.org/files/issues/2025-01-25/support-time-entry-in-bef-3501292-2.patch (Support time entries in FlatpickrDateBef filter plugin)
   Could not apply patch! Skipping. The error was: Cannot apply patch https://www.drupal.org/files/issues/2025-01-25/support-time-entry-in-bef-3501292-2.patch

I am not sure about the previous comment, as it is already committed see #4

I just left it open since BEF throws an error when it is initially added, maybe it is a BEF issue, not sure at this point.

My bad I saw the "needs work" status and the patch and didn't realised it was already merged to 3.0.x