improvement(migration): move credential selector automigration logic … #10438

Job	Run time
Test and Build / Test and Build	3m 19s
Detect Version	4s
Check Docs Changes	0s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	46s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 13s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	2m 15s
Build ARM64 (GHCR Only)	-1s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	7m 36s

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