Use data-drupal-selector as returned target and trigger values

Problem/Motivation

Two of the request headers used by HTMX use the HTML id property. Since these can be dynamic in Drupal, a data-drupal-selector is provided by core.

Proposed resolution

Add to `htmxDrupalPageState()`

// Swap in drupal data selectors as #id values are altered to be unique.
configRequestEvent.detail.headers['HX-Target'] = configRequestEvent.detail.target.dataset.drupalSelector;
configRequestEvent.detail.headers['HX-Trigger'] = configRequestEvent.detail.elt.dataset.drupalSelector;