fix(license): return license separation using separators ,, or, etc.

[DmitriyLewen]

Description

After #6633 we don't split licenses for some language specific files.
see https://github.com/aquasecurity/trivy/pull/6633/files#diff-4da3755149e3538b3a9e2e1a51b97d42a999ae3d240c9d1ce00bdb33e7fceda9L99-L103

Fix this.

Related issues

• Close bug(licenses): Trivy doesn't separate licenses by ,, or, etc. #6915

Related PRs

• refactor: unify Library and Package structs #6633

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[knqyf263]

@DmitriyLewen Need to merge main so Test (ubuntu-latest-m) will run.