Add list item and list ui for resource links

What does this MR do and why?

Related to #230852 (closed)

This MR adds the query to the linked resources widget, to fetch and display the linked resources for an incident.

Part 1 of this feature - !92237 (merged)

Part 2 of this feature - !92352 (merged)

We render the zoom icon on a zoom link and the external-link icon for others. Auto recognizing the link type is not implemented yet.

The buttons on the form and the list are non-functional, this MR just shows the linked resources, if any.

Screenshots or screen recordings

Form closed

Form open

Screen recording

Screen_Recording_2022-07-21_at_2.28.34_PM

How to set up and validate locally

1. Follow the steps on !88826 (merged) to add a resource link using GraphQL API.
2. Open the same incident page on the UI.
3. Check the linked resource on the UI.

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 #230852 (closed)