fix: adding toast after deleting a group

[kiram15]

Screen.Recording.2025-01-14.at.3.52.15.PM.mov

Jira ticket

Testing

• Navigate to https://localhost.stage.edx.org:1991/exec-ed-2u-integration-qa/admin/people-management/
• Create a new group
• Delete that group
• You should be redirected from the Group Detail page back to the People management page, and a toast should appear in the bottom left.

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]

This was giving a warning, I fixed it but it's unrelated to this ticket

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.90%. Comparing base (bd082d3) to head (8334bd1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1383      +/-   ##
==========================================
+ Coverage   85.84%   85.90%   +0.05%     
==========================================
  Files         627      627              
  Lines       13697    13705       +8     
  Branches     2874     2872       -2     
==========================================
+ Hits        11758    11773      +15     
+ Misses       1869     1863       -6     
+ Partials       70       69       -1     

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