(BE) Add migrate_memberships to bulk import entities

Oiza Baiyerequested to merge
481718-be-allow-importing-user-to-choose-to-import-memberships-or-not-3 into master

What does this MR do and why?

Instead of BulkImportConfiguration, we decided that the migrate_memberships field belongs in the entities table. See the discussion here

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #481718 (closed)

Edited by Oiza Baiye

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