Add tooltips for icons in pipelines table

What does this MR do and why?

Adds tooltips for branch, merge request, commit, tag icons seen on pipelines table.

Screenshots or screen recordings

How to set up and validate locally

Visit pipelines table view and check pipelines that have been created by branch, MR or tag

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #239006 (closed)