Add license_configuration_source column to project_settings table

What does this MR do and why?

Add license_configuration_source column to project_settings table. It also updates Gitlab::LicenseScanning::PackageLicenses main logic to use the default value in order to keep the existing behavior.

Follow-up MRs:

• Add graphql endpoint for license configuration ... (!197369 - merged) • Zamir Martins • 18.3
• Add license configuration source to the securit... (!197371 - merged) • Zamir Martins • 18.3

References

Related issue: Allow user to disable using the cycloneDX repor... (#501662 - closed)

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