[frontend] After deleting all expectations from a technical/media/challenge inject, an expectation is added by default to inject again

[isselparra]

Proposed changes

• On Inject update, empty of predefined expectations since they are no needed if all the expectations where removed by the user

Related issues

• Closes After deleting all expectations from a technical/media/challenge inject, an expectation is added by default to inject again #1714

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 33.62%. Comparing base (a20d4d6) to head (a802543).

Additional details and impacted files

@@                Coverage Diff                @@
##             release/1.10.0    #1923   +/-   ##
=================================================
  Coverage             33.62%   33.62%           
  Complexity             1671     1671           
=================================================
  Files                   572      572           
  Lines                 16697    16697           
  Branches                970      970           
=================================================
  Hits                   5614     5614           
  Misses                10829    10829           
  Partials                254      254           

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