Allow dynamic ref types for NVT model

[swaterkamp]

Checklist:

• [ X ] Tests
• [ X ] CHANGELOG Entry

[codecov]

Codecov Report

Merging #1434 into master will increase coverage by <.01%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master    #1434      +/-   ##
==========================================
+ Coverage   35.64%   35.64%   +<.01%     
==========================================
  Files         982      982              
  Lines       22050    22052       +2     
  Branches     6063     6063              
==========================================
+ Hits         7859     7861       +2     
  Misses      12834    12834              
  Partials     1357     1357

Impacted Files	Coverage Δ
gsa/src/web/pages/nvts/references.js	10% <0%> (ø)	⬆️
gsa/src/gmp/models/nvt.js	98.75% <100%> (+0.08%)	⬆️
gsa/src/web/components/link/certlink.js	100% <100%> (ø)	⬆️

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