test(modal-wrapper): increase coverage

[ariellalgilmore]

Closes #17485

Increase coverage for modal wrapper

Changelog

Changed

• check for onkeydown with escape press
• added shouldCloseAfterSubmit when submitting the modalWrapper

Testing / Reviewing

Check codecov increases

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[2nikhiltom]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.41%. Comparing base (29d0f18) to head (41a31d3).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18156      +/-   ##
==========================================
+ Coverage   83.36%   83.41%   +0.04%     
==========================================
  Files         404      404              
  Lines       14344    14344              
  Branches     4650     4596      -54     
==========================================
+ Hits        11958    11965       +7     
+ Misses       2224     2218       -6     
+ Partials      162      161       -1     

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[carbon-automation]

Hey there! v11.72.0 was just released that references this issue/PR.