test(react): increase coverage for DatePicker

[adamalston]

No issue.

Increased test coverage for DatePicker and deleted dead code.

Changelog

Changed

• Increased test coverage for DatePicker.

Removed

• Deleted dead code in DatePicker.

Testing / Reviewing

I deleted dead code:

• calendar.selectedDates comes from Flatpickr and is always an array, so if (!calendar.selectedDates) return; is redundant.
• Two effects both clear the calendar when value is reset to an empty value. The uncovered clear appears to be redundant because the earlier effect already handles the same case.
  

  carbon/packages/react/src/components/DatePicker/DatePicker.tsx

  Line 944 in b4297c5

  calendarRef.current.clear();

yarn test --coverage \
  --runTestsByPath packages/react/src/components/DatePicker/DatePicker-test.js \
  --collectCoverageFrom=packages/react/src/components/DatePicker/DatePicker.tsx

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.83%. Comparing base (69d989e) to head (d0fb0bf).
⚠️ Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21833      +/-   ##
==========================================
+ Coverage   87.75%   94.83%   +7.07%     
==========================================
  Files         536      537       +1     
  Lines       43637    45101    +1464     
  Branches     6696     7950    +1254     
==========================================
+ Hits        38293    42770    +4477     
+ Misses       5193     2187    -3006     
+ Partials      151      144       -7     

Flag	Coverage Δ
main-packages	87.88% <100.00%> (-0.06%)	⬇️
web-components	98.28% <ø> (+10.68%)	⬆️

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[adamalston]

I don't plan to mark this pull request as ready for review until some of my earlier pull requests have been reviewed. I want to avoid diverting attention from them. Otherwise, these changes are ready to go.