ci(core): Reduce memory usage in tests (part-2) (no-changelog) (#7671)

This also gets rid of `Db.collection`, which was another source of
circular dependencies.

packages/cli/test/unit/workflowHistoryHelper.test.ts

@@ -1,7 +1,7 @@
 import { License } from '@/License';
-import { mockInstance } from '../integration/shared/utils';
 import config from '@/config';
 import { getWorkflowHistoryPruneTime } from '@/workflows/workflowHistory/workflowHistoryHelper.ee';
+import { mockInstance } from '../shared/mocking';
 
 let licenseMock: License;
 let licensePruneTime = -1;