Add Severity Date to NVTs Details

[y0urself]

What:

• Add severity Date to NVTs details:

• Will provide Tests in a seperate PR, for backporting.
• Will fix parseDate in a seperate PR

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2802 (a2c2a93) into gsa-21.04 (34466a4) will increase coverage by 0.14%.
The diff coverage is 98.18%.

❗ Current head a2c2a93 differs from pull request most recent head 1206203. Consider uploading reports for the commit 1206203 to get more accurate results

@@              Coverage Diff              @@
##           gsa-21.04    #2802      +/-   ##
=============================================
+ Coverage      53.71%   53.86%   +0.14%     
=============================================
  Files           1072     1075       +3     
  Lines          26223    26212      -11     
  Branches        7474     7477       +3     
=============================================
+ Hits           14086    14118      +32     
+ Misses         11019    10979      -40     
+ Partials        1118     1115       -3     

Impacted Files	Coverage Δ
gsa/src/gmp/cancel.js	100.00% <ø> (ø)
gsa/src/gmp/capabilities/capabilities.js	100.00% <ø> (ø)
gsa/src/gmp/capabilities/everything.js	100.00% <ø> (ø)
gsa/src/gmp/collection/collectioncounts.js	82.60% <ø> (ø)
gsa/src/gmp/collection/parser.js	61.70% <ø> (ø)
gsa/src/gmp/command.js	100.00% <ø> (ø)
gsa/src/gmp/commands/alerts.js	14.28% <ø> (ø)
gsa/src/gmp/commands/audits.js	52.45% <ø> (ø)
gsa/src/gmp/commands/auth.js	100.00% <ø> (ø)
gsa/src/gmp/commands/certbund.js	63.63% <ø> (ø)
... and 267 more

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