test: increase coverage for TimePicker

[somya-05]

Closes #17497

Increase test coverage for TimePicker component.

Changelog

Changed

• Increased test coverage to be above 80%

Testing / Reviewing

Check code coverage and make sure the test cases make sense

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[somya-05]

I have read the DCO document and I hereby sign the DCO.

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[somya-05]

@kennylam @alisonjoseph please review the following changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.12%. Comparing base (99debcc) to head (4d5d0c4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17639      +/-   ##
==========================================
+ Coverage   77.07%   77.12%   +0.04%     
==========================================
  Files         409      409              
  Lines       14021    14021              
  Branches     4327     4307      -20     
==========================================
+ Hits        10807    10814       +7     
+ Misses       3043     3037       -6     
+ Partials      171      170       -1     

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[alisonjoseph]

Test coverage at 83.78% now for TimePicker 👍

[somya-05]

@kennylam please review the changes made