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Remove split_background_migration_on_query_canceled feature flag

Mario Celi requested to merge 378846-remove-split_background_migration_on_query_canceled-ff into master

What does this MR do and why?

The split_background_migration_on_query_canceled feature flag has been enabled globally in production for over a week. We have 2 long running migrations that finished correctly over the weekend (IDS: 223 and 256 in production). Before, we saw a migration failing in staging because of ActiveRecord::QueryCanceled exceptions as those failing batches were not split and retried.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #378846 (closed)

Edited by Mario Celi

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