FormBuilder/SearchKit: add 'enabled' field
Overview
Suggestion: add an 'enabled' field for both Searches and Forms (maybe Segments and related entities as well).
Why?: quite often I clone something, make some changes, switch to that - but don't want to delete the original yet until I'm sure I don't want to revert to it. Marking it as 'not enabled' helps search & form management particularly as the numbers increase.