feat: Add icons to support prompt group

[timogasda]

Description

This adds support for icons to individual prompt items in the support prompt group component. Primary use-case here is to visually indicate that a prompt can be edited by the user, instead of being submitted right away.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.43%. Comparing base (d77e3ef) to head (9d84f1c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   96.31%   96.43%   +0.12%     
==========================================
  Files          30       30              
  Lines         705      729      +24     
  Branches      133      137       +4     
==========================================
+ Hits          679      703      +24     
  Misses         26       26              

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