Replace snippet blobs from type to resolver in GraphQL

What does this MR do?

In this MR we change the blobs type inside the Snippet Resolver to a resolver. That way we can pass the arguments path that will allow us to request specific blobs from the snippet repository.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content