Refactor collection of licenses for dependency list

What does this MR do and why?

This is the fix for #378088 (closed)

As we're transitioning for new architecture for License Scanning feature, where we will be able to get license info from SBOM components, we need to adapt our backend to it. This MR is a part of this initiative.

It doesn't have any user-faced changes.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Have a project with license_scanning and dependency_scanning jobs that are finished.
2. Go to Dependency List page.
3. Observe License column and check that there are no errors.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #378088 (closed)