Build/Test Tools: Skip copying *.min.asset.php files for scripts.

The `index.min.asset.php` file for each script bundled through the built asset from the `gutenberg` repository contains the `dependencies` and `version` hash for each script.

These values are merged into the `script-loader-packages.php` file during a `build`, so the original PHP files are not required.

Props peterwilsoncc, desrosj.
Fixes #64393.

git-svn-id: https://develop.svn.wordpress.org/trunk@62073 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

tools/gutenberg/copy.js

@@ -595,7 +595,7 @@ async function main() {
 
 					for ( const file of packageFiles ) {
 						if (
-							/^index\.(js|min\.js|min\.asset\.php)$/.test( file )
+							/^index\.(js|min\.js)$/.test( file )
 						) {
 							const srcFile = path.join( src, file );
 							// Replace 'index.' with 'package-name.'.