* Create new directories and stub ci templates for:
  * golang-nancy
  * php-composer-outdated
  * php-security-checker
  * python-safety-db
* Move auditjs to npm-auditjs to match dir naming convention
* Remove semgrep rules dir - will not live here
* Update docker images to be language-specific.  This is a
  more cohesive strategy to leverage a single image for a
  group of language-related tools, while also allowing
  additional flexibility to overwrite such images via
  additional env variable assignments.
* Clean up some comments within various ci yaml files
  as they featured unhelpful copypasta messages from
  previously-copied templates.

Bug: T289293