Rename 'license_management' job to 'license_scanning' in the vendored template

Description

We are renaming License Management to License Compliance (&659 (closed)).

Though CI job generating the report itself has nothing to do with compliance. This is why we are renaming it to license_scanning.

We need to align our vendored template to reflect that renaming.

Proposal

This is blocked by https://gitlab.com/gitlab-org/gitlab-ee/issues/8911

• Add a new License-Scanning.gitlab-ci.yml vendored template. Copy content from the existing License-Management.gitlab-ci.yml but use new naming for job name (license_scanning) report type (artifact:report:license_scanning), and report filename (gl-license-scanning-report.json)
• Update the existing License-Management.gitlab-ci.yml with a deprecation notice. We need to keep the old template working until next major release of GitLab (13.0).

Product

• Release Post