test: increase coverage containedlist, layout and textinputskeleton

[alisonjoseph]

Closes #17470
Closes #17473
Closes #17475

Changelog

• add tests for ContainedList, Layout and TextInput.Skeleton

Testing / Reviewing

Tests for ContainedList, Layout and TextInput.Skeleton should be 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.47%. Comparing base (756834c) to head (a50bf57).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17755      +/-   ##
==========================================
+ Coverage   79.33%   79.47%   +0.13%     
==========================================
  Files         406      406              
  Lines       14019    14019              
  Branches     4388     4356      -32     
==========================================
+ Hits        11122    11141      +19     
+ Misses       2731     2712      -19     
  Partials      166      166              

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