feat: adds dimiss confirmation modal

[katrinan029]

https://2u-internal.atlassian.net/browse/ENT-10142

Adds the dismiss confirmation modal.

Screen.Recording.2025-06-12.at.3.38.01.PM.mov

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[kiram15]

Messaged offline, but need to add changes to the dismiss method that calls the LmsApiService before merge here

[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.39%. Comparing base (77d2536) to head (5157007).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/components/FloatingCollapsible/index.tsx	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1538      +/-   ##
==========================================
- Coverage   87.50%   86.39%   -1.11%     
==========================================
  Files         741      742       +1     
  Lines       16744    16805      +61     
  Branches     3445     3450       +5     
==========================================
- Hits        14651    14519     -132     
- Misses       2027     2220     +193     
  Partials       66       66              

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