Build/Test Tools: Copy vendor scripts earlier in the build.

Relocates the `copy-vendor-scripts` to run during the the `build:js` portion of the build script. This ensures the JavaScript files are in place before the `uglify:all` task is run.

Follow up to r61438

Props desrosj.
Fixes #65006. See #64393.


git-svn-id: https://develop.svn.wordpress.org/trunk@62189 602fd350-edb4-49c9-b593-d223f7449a82

Author: peterwilsoncc

Gruntfile.js

@@ -1837,6 +1837,7 @@ module.exports = function(grunt) {
 		'clean:js',
 		'build:webpack',
 		'copy:js',
+		'copy-vendor-scripts',
 		'file_append',
 		'uglify:all',
 		'concat:tinymce',
@@ -2133,7 +2134,6 @@ module.exports = function(grunt) {
 				'build:css',
 				'build:codemirror',
 				'build:gutenberg',
-				'copy-vendor-scripts',
 				'build:certificates'
 			] );
 		} else {
@@ -2145,7 +2145,6 @@ module.exports = function(grunt) {
 				'build:css',
 				'build:codemirror',
 				'build:gutenberg',
-				'copy-vendor-scripts',
 				'replace:source-maps',
 				'verify:build'
 			] );