Template Part: Update switching trigger (#29257)

* Swap the Chevron icon button for a text button

* use ToolbarButton component

Co-authored-by: Addison-Stavlo <stavz01@gmail.com>

packages/block-library/src/template-part/edit/index.js

@@ -15,7 +15,6 @@ import {
 	Spinner,
 } from '@wordpress/components';
 import { __ } from '@wordpress/i18n';
-import { chevronUp, chevronDown } from '@wordpress/icons';
 import { store as coreStore } from '@wordpress/core-data';
 
 /**
@@ -116,15 +115,13 @@ export default function TemplatePartEdit( {
 								renderToggle={ ( { isOpen, onToggle } ) => (
 									<ToolbarButton
 										aria-expanded={ isOpen }
-										icon={
-											isOpen ? chevronUp : chevronDown
-										}
-										label={ __( 'Choose another' ) }
 										onClick={ onToggle }
 										// Disable when open to prevent odd FireFox bug causing reopening.
 										// As noted in https://github.com/WordPress/gutenberg/pull/24990#issuecomment-689094119 .
 										disabled={ isOpen }
-									/>
+									>
+										{ __( 'Replace' ) }
+									</ToolbarButton>
 								) }
 								renderContent={ ( { onClose } ) => (
 									<TemplatePartSelection