Remove unused code from GitLab Advanced SAST

Proposal

The purpose of this issue is to remove unused code from GitLab Advanced SAST.

Implementation Plan

1. Remove or address TODO comments that link to issues that have been resolved:

   • TODO: adapt addAnalyzerIdentifiers for Gitlab Advanced SAST
   • TODO: remove this temp hack

2. As mentioned here, configPath is not used by the analyze function, but it is used in the convert function, which might be incorrect, since it seems like it should either be used in both places, or neither place (to be confirmed).

   We should either add an integration test, if the behaviour implemented here is necessary, or remove it if it's not necessary.