Remove deprecated method from PrimaryKeyBatchingStrategy
What does this MR do and why?
After !95133 (merged) and !96198 (merged) we no longer use PrimaryKeyBatchingStrategy#apply_additional_filters
. This MR removes this method and the related tests.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #357900 (closed)