SearchKit - Merge admin results table with searchDisplay code

[colemanw]

Overview

This improves and streamlines the SearchKit Angular code to reconcile 2 different ways of fetching, formatting & displaying results. This reduces code duplication, while adding a few features from the admin table to all search display tables.

Before

The SearchDisplay subsystem has its own way of fetching, formatting and displaying a table of results, which looked nearly identical to the table on the SearchKit admin screen, but used completely different code. This redundancy was starting to cause maintenance headaches.

After

Consolidated all search results to use SearchDisplay code. 2 features on the admin table that were missing from SearchDisplays (a search button and adjustable page size) have been added. One "extra" feature from the admin table (the "Search/Auto" toggle) has been dropped; it may have been more confusing than helpful.

Technical Details

This greatly simplifies the SearchKit admin code by handing off the table to a specialized searchDisplay (adapted from crmSearchDisplayTable). Builds on the refactoring done in #21049

Before / After Comparison

Despite having all its code ripped out, the admin table looks almost identical:

Before	After

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[colemanw]

I've rebased this now that #21049 has been merged.

[eileenmcnaughton]

I gave this a light r-run & could not detect any differences - which is a good thing. I think merging this now (fairly early in the cycle) is good as it should give us time to find anything....