fix(auth): show "account already exists" on duplicate email signup (#… #18050

Job	Run time
Detect Version	4s
Test and Build / Test and Build	5m 3s
Check Docs Changes	0s
Build Dev ECR	0s
Build ARM64 (GHCR Only)	0s
Migrate Dev DB	0s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	3m 49s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	56s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	48s
Process Docs	0s
Create GitHub Release	0s
Create GHCR Manifests	-1s
	10m 39s

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