Step 7: Version Control for Snippets: Run background migration (MVP)

In #39202 (closed) we implemented the background migration to backfill snippet repositories with the content stored in content and file_name columns.

The feature flag :version_snippets should be removed, otherwise, on-premise users won't be able to run it

The background migration can be something like:

 INTERVAL = 5.minutes.to_i
 BATCH_SIZE = 50 # we lower the number because the commit operations take longer
 MIGRATION = 'BackfillSnippetRepositories'

 Snippet.all.each_batch(of: BATCH_SIZE) do |batch, index|
   range = batch.pluck('MIN(id)', 'MAX(id)').first
   delay = index * INTERVAL
   BackgroundMigrationWorker.perform_in(delay, MIGRATION, *range)
 end

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