fix(mongodb-schemas): expose extendable base before .refine #17064

Job	Run time
Detect Version	4s
Test and Build	0s
Check Docs Changes	0s
Build Dev ECR (./docker/realtime.Dockerfile, ECR_REALTIME)	48s
Build Dev ECR (./docker/db.Dockerfile, ECR_MIGRATIONS)	50s
Build Dev ECR (./docker/app.Dockerfile, ECR_APP)	3m 36s
Build ARM64 (GHCR Only)	0s
Build AMD64	0s
Create GHCR Manifests	0s
Process Docs	0s
Create GitHub Release	0s
Migrate Dev DB / Apply Database Migrations	29s
	5m 47s

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