fix(mcp): don't blank the MCP tools page when tool discovery fails (#… #22901

Job	Run time
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	2m 27s
Detect Version	4s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	44s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 33s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	41s
Test and Build / Build App	5m 17s
Test and Build / Lint and Test	4m 48s
Check Docs Changes	0s
Migrate Dev DB	0s
Deploy Trigger.dev (Dev)	0s
Build ARM64 (GHCR Only)	0s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	39s
Promote Images	15s
Create GHCR Manifests	-1s
Process Docs	-1s
Create GitHub Release	-1s
	20m 25s

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