filter out unimportant vulnerabilities from vuln group

[hogo6002]

#968 only filters out unimportant vulnerabilities from pkgVulns.Vulnerabilities but not from pkgVulns.Groups. This causes some unimportant vulnerabilities to still appear in the scanner output.
Fixing this issue by ignoring all unimportant vulnerability groups.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.35%. Comparing base (fdca369) to head (e6b1130).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1072   +/-   ##
=======================================
  Coverage   65.34%   65.35%           
=======================================
  Files         150      150           
  Lines       12529    12535    +6     
=======================================
+ Hits         8187     8192    +5     
- Misses       3882     3883    +1     
  Partials      460      460           

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