Add parseTrend() function to ScanConfig model

[swaterkamp]

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1583 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1583      +/-   ##
==========================================
+ Coverage   38.02%   38.03%   +0.01%     
==========================================
  Files        1043     1043              
  Lines       23836    23831       -5     
  Branches     6558     6555       -3     
==========================================
+ Hits         9063     9064       +1     
+ Misses      13432    13427       -5     
+ Partials     1341     1340       -1

Impacted Files	Coverage Δ
gsa/src/gmp/models/scanconfig.js	95.58% <100%> (+0.06%)	⬆️
gsa/src/web/entity/withEntityContainer.js	40.9% <0%> (ø)	⬆️
gsa/src/web/pages/tlscertificates/details.js	22.22% <0%> (ø)	⬆️
gsa/src/web/pages/reports/detailscontent.js	10.75% <0%> (+0.22%)	⬆️
gsa/src/gmp/models/tlscertificate.js	10.81% <0%> (+1.05%)	⬆️

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