fix: Support pressedIconSvg in button group

[just-boris]

Description

Self explanatory

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

How has this been tested?

n/a

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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[just-boris]

This is funny

There is an existing test on pressed icon state, but because of a bug here, it incorrectly propagated pressedIconSvg as a normal iconSvg, making the test false positive

All fixed now

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.50%. Comparing base (22d5a6b) to head (64fb7ef).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4595   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files         948      948           
  Lines       30262    30262           
  Branches    11027    11026    -1     
=======================================
  Hits        29507    29507           
- Misses        708      748   +40     
+ Partials       47        7   -40     

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