Rename squash before merge vue component

What does this MR do?

• Renames squash before merge vue component.
• Deletes unnecessary relevant .js file.

What are the relevant issue numbers?

This is a follow-up from !18956 (merged).

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides