[frontend] Fix mass selection with the shift key in incidents container (#6283)

[CelineSebe]

Proposed changes

• add onToggleShiftEntity

Related issues

• Mass selection with the shift key does not work on Incident #6283

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.25%. Comparing base (698b5a3) to head (a7ae3c9).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6331      +/-   ##
==========================================
+ Coverage   66.71%   67.25%   +0.53%     
==========================================
  Files         541      541              
  Lines       64501    64501              
  Branches     5288     5569     +281     
==========================================
+ Hits        43033    43379     +346     
+ Misses      21468    21122     -346     

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[SarahBocognano]

Tested ✅