Data: Improve hasResolvingSelectors redux metadata selector (#50865)

* Remove unnecessary array cloning

* Document internal property usage

* Use Array.from() instead of spread

* Correct docs

Author: tyxla

packages/data/src/redux-store/metadata/selectors.js

@@ -140,8 +140,15 @@ export function getCachedResolvers( state ) {
  * @return {boolean} True if one or more selectors are resolving, false otherwise.
  */
 export function hasResolvingSelectors( state ) {
-	return [ ...Object.values( state ) ].some( ( selectorState ) =>
-		[ ...selectorState._map.values() ].some(
+	return Object.values( state ).some( ( selectorState ) =>
+		/**
+		 * This uses the internal `_map` property of `EquivalentKeyMap` for
+		 * optimization purposes, since the `EquivalentKeyMap` implementation
+		 * does not support a `.values()` implementation.
+		 *
+		 * @see https://github.com/aduth/equivalent-key-map
+		 */
+		Array.from( selectorState._map.values() ).some(
 			( resolution ) => resolution[ 1 ]?.status === 'resolving'
 		)
 	);