Enable license_scanning_sbom_scanner feature flag in staging environment QA E2E tests

Proposal

While working on Implement License Scanning SBOM scanner (!109447 - merged), we had to stub the license_scanning_sbom_scanner feature flag to false in the e2e tests because:

1. These tests rely on license data being present in the database, which means they can only be tested in "live" environments such as staging or production.
2. There's currently no license data in the database (for example, the pm_packages, pm_licenses, pm_package_versions tables are empty).

The purpose of this issue is to remove this stub, and test when the license_scanning_sbom_scanner feature flag is set to true in a live staging environment once we have license data in the database.

/cc @willmeek @fcatteau @gonzoyumo