fix: allow configure modal overflow to prevent datepicker clipping

[asajjad2]

What are the relevant tickets?

#10311

Description (What does it do?)

The PR fixes the Release date datepicker being clipped in the section configure modal (three-dot menu → Release date) by enabling overflow on the modal isOverflowVisible={true} so the calendar can extend outside the modal like the timepicker, and by giving the datepicker popper a higher z-index inside the configure modal so the dropdown appears above other content.

Screenshots

Before:

After:

Testing Steps

1. Open a course in Studio and go to the Course Outline.
2. Find any section and open the three-dot menu on that section, Select Configure and then Basic tab.
3. In the modal, focus or click the Release date field (e.g. the one that shows “MM/DD/YYYY” or a date like “01/01/2024”) so the datepicker calendar opens.
4. Verify that the full calendar is visible: month/year at the top, day-of-week row (Mon, Tue, …), and the grid of dates. Nothing is cut off at the top of the modal.

[openedx-webhooks]

Thanks for the pull request, @asajjad2!

This repository is currently maintained by @bradenmacdonald.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.28%. Comparing base (b57386b) to head (7583dc8).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2901    +/-   ##
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  Coverage   95.28%   95.28%            
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  Files        1334     1334            
  Lines       30615    30615            
  Branches     6706     6914   +208     
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  Hits        29170    29170            
+ Misses       1388     1376    -12     
- Partials       57       69    +12     

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[bradenmacdonald]

Thanks!