fix(datepicker): focus trap in FireFox

[2nikhiltom]

Closes #17663

Fixes focus trap in datepicker range variant during Keyboard Navigation in Firefox browser

Changelog

Removed

Removes the manual blur() function when closing the calendar to fix issues with focus in Firefox.
document.activeElement.blur()
blur() was initially added as a secondary safeguard to prevent the focus from staying on the input

Testing / Reviewing

open deploy preview in FireFox
Open DatePicker - "range with Calendar" storybook example
Select the dates using keyboard after selection of end date press tab and verify that the focus moves to the next focusable element in the DOM

Verify the clicking away from datepicker closes any open calendars

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.78%. Comparing base (ba6bf6d) to head (2f551e0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17969      +/-   ##
==========================================
+ Coverage   81.76%   81.78%   +0.01%     
==========================================
  Files         406      406              
  Lines       14053    14048       -5     
  Branches     4408     4405       -3     
==========================================
- Hits        11491    11489       -2     
+ Misses       2400     2397       -3     
  Partials      162      162              

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[guidari]

LGTM!

[github-actions]

The content of this pull request will be made available as part of our next release. For the full schedule of upcoming releases, check out our Release Radar page.

[carbon-automation]

Hey there! v11.70.0 was just released that references this issue/PR.