Remove support for V1 license format from Rails app

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Why are we doing this work

As per Deprecate V1 metadata format for licenses (#438477 - closed), GitLab will no longer make the V1 metadata available from the release date of %18.0.

This has been achieved with Remove license data for V1 format from the GCP ... (#440535 - closed).

Now we must clean up the code from anything related to v1 data handling.

Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

1. Remove v1-related code from gitlab-org/gitlab
   • Remove CsvDataFile and references to this object.
   • BaseConnector (remove sync_config.v2?)
   • SyncConfiguration
   • IngestionService (this solely handles v1, v2 is handled by CompressedPackage::IngestionService)
     • And all ingestion tasks under ee/app/services/package_metadata/ingestion/tasks
   • Rename CompressedPackage::IngestionService to License::IngestionService (structured like Advisory::IngestionService)
   • Data migration (using post-deployment migrations)
     • Remove foreign keys from pm_package_versions and pm_package_version_licenses tables
     • Drop pm_package_versions and pm_package_version_licenses tables
   • Docs
     • Update offline docs to remove mentions of v1 version_format
     • And add instructions on how to remove local v1 package_metadata

Verification steps