We are stopping usage of Tenant Migrations and the tests are causing some infrequent BFs.  We want to remove all code and reamining test. This should include :

• TenantMigrationRecipientService
• All logic for MigrationProtocolEnum::kMultitenantMigrations in TenantMigrationDonorService
  • Removing kMultitenantMigrations to identify dead code might be worth doing to
• kMultitenantMigrations logic in tenant_oplog_applier.cpp
• TenantMigrationRecpientOpObserver