Fix(Dropdown): Made the titleText required property

[Thamjith]

Closes #17843

This PR makes the titleText an optional property in the propTypes, since we are only showing titleText conditionally.

Changelog

Changed

• Made the titleText optional in propTypes.

Testing / Reviewing

• Remove the titleText property from in "packages/react/src/components/Dropdown/Dropdown.stories.js"
• Navigate to the packages/react directory using cd packages/react and run yarn storybook
• Check the console in browsers's developer tools

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[Thamjith]

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

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[Thamjith]

recheck

[tay1orjones]

I think this should be required even though it's conditionally rendered.

• [a11y]: Dropdown titleText prop should be marked as required #12809
• fix(dropdown): make titleText required #13016

[Thamjith]

@tay1orjones updated the code to make the titleText property required instead of optional.

[tay1orjones]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.79%. Comparing base (098bfb8) to head (d54f8c4).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17854   +/-   ##
=======================================
  Coverage   80.79%   80.79%           
=======================================
  Files         406      406           
  Lines       14041    14041           
  Branches     4395     4395           
=======================================
  Hits        11344    11344           
+ Misses       2531     2530    -1     
- Partials      166      167    +1     

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[annawen1]

There was a duplicate ticket and the fix was already merged in #17886, but I'm going to go ahead and approve so @Thamjith can get credit for his contribution!