Add ability to search for deploy keys

What does this MR do and why?

This updates the list selector component to support searching for deploy keys as part of Edit source code rules organized by branches.

Screenshots or screen recordings

⚠ No visual changes are expected from this MR as the component is not used yet.

This is what we're working towards:

How to set up and validate locally

No visual changes are expected from this MR as the component is not used yet.

If you still want to test you can just add the component to any Vue app: <list-selector type="deployKeys" :selected-items="[{title: 'my title', owner: 'owner1', id: 5 }]" :project-path="projectPath" />

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 #431769 (closed)