[PM-6965] Add type Property to MigrationHelper (#8411)

* Add `type` Property to `MigrationHelper`

* Fix Tests

* Make `type` parameter required

* Fix mockHelper.type

* Remove `readonly` from `type`

libs/common/src/platform/services/migration-builder.service.spec.ts

@@ -82,6 +82,7 @@ describe("MigrationBuilderService", () => {
       startingStateVersion,
       new FakeStorageService(startingState),
       mock(),
+      "general",
     );
 
     await sut.build().migrate(helper);