Remove suggested colors hover underline

What does this MR do?

• Removes the blue hover underline for the suggested color containers
• Added cursor: pointer to the suggested color containers

Are there points in the code the reviewer needs to double check?

Shouldn't be

Why was this MR needed?

Improves UI

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #21792 (closed)

app/assets/stylesheets/pages/labels.scss

@@ -7,6 +7,7 @@
     display: inline-block;
     margin-right: 10px;
     margin-bottom: 10px;
+    text-decoration: none;
   }
   &.suggest-colors-dropdown {