Reuse scanconfig edit dialogs for policies and add tests for san config edit dialogs

[sarahd93]

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1573 into master will increase coverage by 1.39%.
The diff coverage is 65%.

@@            Coverage Diff             @@
##           master    #1573      +/-   ##
==========================================
+ Coverage   36.44%   37.83%   +1.39%     
==========================================
  Files        1045     1042       -3     
  Lines       23990    23795     -195     
  Branches     6592     6542      -50     
==========================================
+ Hits         8744     9004     +260     
+ Misses      13844    13443     -401     
+ Partials     1402     1348      -54

Impacted Files	Coverage Δ
gsa/src/web/pages/scanconfigs/trend.js	85.71% <ø> (+57.14%)	⬆️
...rc/web/pages/scanconfigs/editconfigfamilydialog.js	91.66% <ø> (+85%)	⬆️
gsa/src/web/pages/scanconfigs/component.js	0.59% <ø> (ø)	⬆️
.../src/web/pages/scanconfigs/editnvtdetailsdialog.js	86.66% <ø> (+83.33%)	⬆️
gsa/src/web/pages/policies/component.js	1.27% <0%> (-0.01%)	⬇️
gsa/src/web/pages/scanconfigs/editdialog.js	94.26% <100%> (+85.49%)	⬆️
gsa/src/web/utils/severity.js	74.32% <0%> (+1.35%)	⬆️
gsa/src/web/components/table/table.js	90.9% <0%> (+9.09%)	⬆️
gsa/src/web/components/folding/folding.js	39.53% <0%> (+26.74%)	⬆️
gsa/src/web/components/section/header.js	84.61% <0%> (+38.46%)	⬆️
... and 9 more

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[swaterkamp]

Please also remove the policy edit dialogs from the CMakeLists