fix(mcp): use HTTP/1.1 for the streamable-HTTP transport (drop allowH… #22837

Job	Run time
Detect Version	3s
Test and Build / Lint and Test	2m 37s
Test and Build / Build App	2m 27s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	2m 33s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	53s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	4m 31s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	25s
Build ARM64 (GHCR Only)	0s
Check Docs Changes	0s
Deploy Trigger.dev (Dev)	0s
Migrate Dev DB	0s
Build Dev ECR	-1s
Migrate DB / Apply Database Migrations	27s
Promote Images	14s
Create GHCR Manifests	0s
Process Docs	0s
Create GitHub Release	0s
	14m 9s

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