SearchKit - Misc bulk action bug fixes

[colemanw]

Overview

Minor bug fixes in SearchKit bulk actions.

Before

• Deleting one or more records with the bulk delete action would still leave them selected, leading to a confusing message about e.g. "2 Contacts selected" even when they were gone:
  
• Choosing a date field, e.g. "Birth Date" from the bulk update dialog would show it as a text input rather than date:
  
• Clearing a field (by pressing the x in the Select2) would cause javascript errors in the console:
  

After

All better 🩹

[civibot]

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[eileenmcnaughton]

@colemanw this worked fine for me in testing so it's mergeable - I just wanted to highlight that I DID get a console error in testing on the demo site - it looks like the url has a pre-ceding space.

Go ahead & merge if this is unrelated (although ideally fix it or log to gitlab if you do)

[colemanw]

@eileenmcnaughton I'm having a hard time reading that console message but it looks like it's coming from the Drupal "system" module?

[eileenmcnaughton]

@colemanw I went back to the demo site today and didn't see it - only