chore: Extensible test utils prep

[pan-kot]

Description

I am preparing a change to the test-utils to allow overriding ElementWrapper methods such as fundButton to return a n updated/custom version of the component. That can only work if the component test utils do not rely on the existing generated methods (use other component wrapper directly) - which can be ensured with a simple test, which this PR adds.

Rel: D397469120

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 97.42%. Comparing base (5cfcc6d) to head (ad0941d).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4284   +/-   ##
=======================================
  Coverage   97.42%   97.42%           
=======================================
  Files         891      891           
  Lines       26098    26104    +6     
  Branches     9435     9436    +1     
=======================================
+ Hits        25426    25432    +6     
  Misses        629      629           
  Partials       43       43           

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