Reduce the amount of duplication across BulkImport codebase

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Suggestion from !56018 (comment 526104862)

Problem

We have a fair amount of duplication in BulkImport codebase (e.g. compare !56018 (merged) & !55981 (merged)) as well as in the tests. Any change in shared functionality can trigger a need in updating a lot of test and a lot of pipelines.

Identify common patterns, behaviours and shared examples that can be extracted in order to reduce the amount of duplication throughout BulkImport codebase.