GitLab Migration - Migrate MR approvers

Migrate MR approvals when using GitLab Projects Migration

This is currently not happening and such data is lost:

Source project (GitLab)	➡️	Destination project (GitLab)
	➡️

Proposed Solution

• All migrated MRs should maintain approval statuses.

Documentation

Following documentation should be updated with the objects/fields added in this issue:

• User docs: https://docs.gitlab.com/ee/user/group/import/
• Dev docs: https://docs.gitlab.com/ee/development/bulk_import.html

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