Follow-up from "Adds CI information to candidate detail"

The following discussion from !119788 (merged) should be addressed:

@annabeldunstone says:

Looks like this was already merged, but the only thing I can think we may want to improve is how we're rendering the value data you just added.

• For triggered by we could also add the user avatar next to the name (eg )
• For merge request we could add the ID with the title, like !119788 Adds CI information to candidate detail