Media: Make the "Copy URL" button implementation more consistent with other instances in core:

* Make the "Copied!" text green.
* Make the button verbiage clear that it's copied "to clipboard".

Props garrett-eclipse, mukesh27.
Fixes #51355.

git-svn-id: https://develop.svn.wordpress.org/trunk@49064 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/media.css

@@ -804,7 +804,12 @@ border color while dragging a file over the uploader drop area */
 	clear: both;
 }
 
+.copy-to-clipboard-container .copy-attachment-url {
+	white-space: normal;
+}
+
 .copy-to-clipboard-container .success {
+	color: #40860a;
 	margin-left: 8px;
 }