Add support for 'license_scanning' reports

Problem to solve

We are renaming License Management to License Compliance (see &659 (closed)), though the report itself has nothing to do with compliance. This is why we are renaming it to license_scanning on the technical side.

Proposal

We need to support the license_scanning name along with license_management, in every place this is used.

1. support new reports named license_scanning
2. modify backend code to also support license_scanning in every place where license_management is currently used
3. [ ] modify frontend code to also support license_scanning in every place where license_management is currently used. Let's avoid wasting time on this, logic is being moved to the backend. See here and here.
4. modify frontend code to replace License Compliance in every place where License Management is currently used
5. update documentation and mention deprecation of license_management naming, with support being dropped in the next major (13.0)
   • https://docs.gitlab.com/ee/ci/yaml/README.html#artifactsreportslicense_management-ultimate
   • https://docs.gitlab.com/ee/user/application_security/license_compliance/index.html#configuration

Implementation plan

• Rename all mentions in Rails code #26574 (closed) - will need follow-up issue
• Rename artifact #26604 (closed)
• Rename report file #26470 (closed)
• Update documentation #26590 (closed)
• Support license_scanning in counting usage_data !23690 (merged)
• Support for license_scanning in MR and Pipelines tab !23537 (merged)

Product

• Release Post - Not Needed