Follow-up from "Store DAST scan results into the database"

The following discussion from !9192 (merged) should be addressed:

• @grzesiek started a discussion: (+2 comments)

  The code in this class feel a bit feature envy. Would we benefit from having a class extracted, perhaps something like Parsers::Dast::Vulnerability and / or Parsers::Dast::Report. It is quite difficult to follow what is happening in this class because we have a bunch of methods and it does not feel coherent.