Export SCANNING_JOB_NAME

What does this MR do?

Export name of scanning job as SCANNING_JOB_NAME. We get that variable by removing the qa- prefix.

$ CI_JOB_NAME=qa-gemnasium-maven-dependency_scanning
$ echo ${CI_JOB_NAME#qa-}                           
gemnasium-maven-dependency_scanning

This fixes !368 (merged)

See gitlab-org/security-products/analyzers/integration-test!50 (diffs, comment 1590982163)

What are the relevant issue numbers?

None

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug