chore: Add design tokens for feedback dialog

[cansuaa]

Description

Adding two design tokens for the feedback dialog; one for background and one for border color

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 96.45%. Comparing base (6f86b52) to head (5693858).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3227   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files         791      791           
  Lines       22314    22315    +1     
  Branches     7601     7658   +57     
=======================================
+ Hits        21523    21524    +1     
- Misses        739      784   +45     
+ Partials       52        7   -45     

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