ESoCC: Migration command to ensure channel versioned content databases exist

[AlexVelezLl]

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Overview

Until now, we were invoking a background task to do this check, and we were invoking this on a CommunityLibrarySubmission creation to make sure this content database existed in a future stage. However, now we will use a migration command to ensure that all channels in Studio have a versioned content database for their most recent version. For this, we will:

• Query all published=True Channels.
• Iterate through each channel, and call the ensure_versioned_database_exists method for each
  • Use .iterator() method to iterate through the channels to prevent fetching all channels at once.
• Since this will fix the issue from the root, we can now remove the ensure_versioned_database_exists_task and all its references.

Acceptance criteria

• All published channels should have a versioned content database after running this command.