fix: process k8s_service_name during activation update

[bzwei]

Fix an internal 500 error when calling api to update an activation on k8s

AAP-42437

If no new name or k8s_service_name is provided when request updating the activation, the values from the existing activation are pulled. They are needed for validation.
In addition, when the k8s_service_name is cleared through the update request, it will be regenerated with the default value.

To test the fix

1. Update an activation without changing name on k8s, it no longer raises a 500 internal error.
2. Create an activation with a customized k8s_service_name and clear it through an update, verify the activation's k8s_service_name is assigned to a default value generated based on the activation name.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.56%. Comparing base (3bc5173) to head (b1ae98b).

@@            Coverage Diff             @@
##             main    #1243      +/-   ##
==========================================
+ Coverage   94.50%   94.56%   +0.05%     
==========================================
  Files         309      309              
  Lines       18047    18059      +12     
==========================================
+ Hits        17055    17077      +22     
+ Misses        992      982      -10     

Flag	Coverage Δ
unit-int-tests-3.11	94.50% <100.00%> (+<0.01%)	⬆️
unit-int-tests-3.12	94.56% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/aap_eda/api/serializers/activation.py	96.09% <100.00%> (+0.01%)	⬆️
src/aap_eda/api/views/activation.py	97.66% <100.00%> (+0.05%)	⬆️
tests/integration/api/test_activation.py	98.76% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

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[zkayyali812]

Hey @bzwei, did you test this on OCP to validate that this fixes the ATF tests?

[bzwei]

Hey @bzwei, did you test this on OCP to validate that this fixes the ATF tests?

Not directly on OCP. I can reproduce the issue with pytest and verify the fix with the pytest too.