Build/Test Tools: Optimize uglify:core and copy:files glob patterns in Grunt tasks.

The `uglify:core` and `copy:files` tasks utilized broad negative glob patterns (`!**/*.min.js` and `!**/*.map`) to exclude files from processing. The glob expansion scans the entire `src/` directory tree, including `wp-content`. For environments where `wp-content` contains deep directory structures (such as plugins with `node_modules` dependencies) this traversal becomes prohibitively slow, causing the build process to hang.

This change scopes the exclusion patterns to specific directories (e.g. `wp-admin`, `wp-includes`, default themes, and Akismet), limiting the file scan to relevant core paths and preventing unnecessary recursion into `wp-content`.

In one dev environment, this reduces `npm run build:dev` from 43s to 9s, and `npm run build` from 51s to 13s.

Developed in WordPress#10809

Follow up to [61475].

Props westonruter, jonsurrell.
See #63606.
Fixes #64563.


git-svn-id: https://develop.svn.wordpress.org/trunk@61545 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

Gruntfile.js

@@ -286,7 +286,7 @@ module.exports = function(grunt) {
 							'!wp-includes/certificates/legacy-1024bit.pem',
 							'!.{svn,git}', // Exclude version control folders.
 							'!wp-includes/version.php', // Exclude version.php.
-							'!**/*.map', // The build doesn't need .map files.
+							'!{wp-admin,wp-includes,wp-content/themes/twenty*,wp-content/plugins/akismet}/**/*.map', // The build doesn't need .map files.
 							'!index.php', '!wp-admin/index.php',
 							'!_index.php', '!wp-admin/_index.php'
 						] ),
@@ -925,7 +925,7 @@ module.exports = function(grunt) {
 					'wp-includes/js/tinymce/plugins/wp*/plugin.js',
 
 					// Exceptions.
-					'!**/*.min.js',
+					'!{wp-admin,wp-includes}/**/*.min.js',
 					'!wp-admin/js/custom-header.js', // Why? We should minify this.
 					'!wp-admin/js/farbtastic.js',
 					'!wp-includes/js/wp-emoji-loader.js', // This is a module. See the emoji-loader task below.