Add tests for severitylevelsgroup, radio and task trend

[sarahd93]

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1413 into gsa-8.0 will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           gsa-8.0    #1413      +/-   ##
===========================================
+ Coverage    36.82%   36.83%   +0.01%     
===========================================
  Files          961      960       -1     
  Lines        21737    21741       +4     
  Branches      6020     6017       -3     
===========================================
+ Hits          8004     8009       +5     
+ Misses       12410    12409       -1     
  Partials      1323     1323

Impacted Files	Coverage Δ
gsa/src/gmp/http/transform/fastxml.js	20% <0%> (-80%)	⬇️
gsa/src/gmp/http/response.js	52.63% <0%> (-27.37%)	⬇️
gsa/src/gmp/http/transform/x2js.js	18.18% <0%> (-26.27%)	⬇️
gsa/src/gmp/models/filter/convert.js	100% <0%> (ø)	⬆️
gsa/src/gmp/http/rejection.js	100% <0%> (ø)	⬆️
gsa/src/gmp/models/testing.js	100% <0%> (ø)	⬆️
gsa/src/gmp/http/transform/xml.js
gsa/src/gmp/parser.js	99.14% <0%> (ø)	⬆️
gsa/src/web/utils/withComponentDefaults.js	100% <0%> (+25%)	⬆️
.../web/components/powerfilter/severitylevelsgroup.js	85.71% <0%> (+80.95%)	⬆️
... and 1 more

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