Add custom data when creating smart group

[awestuk]

Overview

Adds group custom fields when creating a new smart group from search action Group -> Create Smart Group

Before

After

Technical Details

Mostly just copies #21716.

[civicrm-builder]

Can one of the admins verify this patch?

[civibot]

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[mattwire]

This seems ok to me. I guess @colemanw may want to take a quick look in case there are any better ways of doing some of this now?

[seamuslee001]

Jenkins ok to test

[yashodha]

@awestuk You might want to squash your commits. Thanks!

[aydun]

Test this please

[mlutfy]

I think CRM_Core_Form_EntityFormTrait is a way to simplify Entity forms that have custom fields and avoid copy-paste, but since it's a small change and makes it consistent with #21716, I am inclined to merge.

[colemanw]

Looks good to me as well