fix: [AAP-47135] Only return user-input extra_var to the UI

[hsong-rh]

Remove the extra_var from credential types, and only return user-input ones.

Before:

After:

https://issues.redhat.com/browse/AAP-47135

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.91%. Comparing base (2db001e) to head (531c3a7).

@@            Coverage Diff             @@
##             main    #1340      +/-   ##
==========================================
- Coverage   93.91%   93.91%   -0.01%     
==========================================
  Files         318      318              
  Lines       18742    18741       -1     
==========================================
- Hits        17602    17601       -1     
  Misses       1140     1140              

Flag	Coverage Δ
unit-int-tests-3.11	93.85% <100.00%> (-0.01%)	⬇️
unit-int-tests-3.12	93.91% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
src/aap_eda/api/serializers/activation.py	96.17% <ø> (ø)
...integration/api/test_activation_with_credential.py	100.00% <100.00%> (ø)
...tegration/api/test_activation_with_event_stream.py	96.40% <100.00%> (-0.02%)	⬇️

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[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