Added target branch link to Vue merge request list

What does this MR do and why?

Added a target branch link to the Vue merge request list. This link is only visible when the target branch is different to the default branch.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.