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Batched background migrations: Make PrimaryKeyBatchingStrategy easy to extend

Krasimir Angelov requested to merge bbm-make-pk-batching-startegy-easy-to-extend into master

What does this MR do and why?

This MR makes it easy to sub-class PrimaryKeyBatchingStrategy and add additional filters.

Example:

class TypeIsNotNull < PrimaryKeyBatchingStrategy
  def apply_additional_filters(relation)
    relation.where.not(type: nil)
  end
end

MR acceptance checklist

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

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