Enable bash exit code checks in Dependency Scanning QA jobs

What does this MR do?

This MR enables the FF_ENABLE_BASH_EXIT_CODE_CHECK feature flag for all Dependency Scanning QA jobs. This is needed to enable what is the default behavior of Bash outside the Runner context, i.e. cmd1 && cmd2 fails if either command fails. This behavior is unintuitive, and makes it hard to know when jobs are silently failing as was the case for offline branches.

What are the relevant issue numbers?

Closes gitlab-org/gitlab#389449 (closed)

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
  • See gitlab-org/security-products/tests/scala-sbt!78 (closed) for an example run of the FF.