GitLab Migration - Migrate Snippets Repositories

This needs to be worked on after we close this: #339406 (closed)

The strategy to migrate Snippets and repositories is described here: #339406 (comment 707741948)

For an initial solution we want to:

• Have 2 pipelines:
  • 1st pipeline imports snippest via ndjson
  • 2nd pipeline imports repos via graphql (queries all the imported snippets from db, then query all their url from graphql).
• we will do the 2nd pipeline this sinchronously for now, but paginating the snippets by 100 batch.
• NOT hardfail the migration if a snippet pipeline fails.

...

It is possible to use either, import_repository or fetch_as_mirror. For fetch_as_mirror we need to create the repository first with snippet.create_repository.

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