Move license management reports backend for pipeline

What does this MR do?

Adds end point for serving license management reports.

Does this MR meet the acceptance criteria?

• Run gitlab ee in your local machine
• Import a project and configure license management
• Run a pipeline with license management configuration i.e. check ruby-bundler test project for config details
• hit http://localhost:3001/gitlab-org/ruby-bundler/pipelines/74/licenses.json (change pipeline id and project it)
• you should get licenses and their dependencies in json format

Related issue

https://gitlab.com/gitlab-org/gitlab-ee/issues/12019

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team