improvement(metrics): emit hosted-key metrics to CloudWatch instead o… #18387

Job	Run time
Test and Build / Test and Build	4m 57s
Detect Version	4s
Check Docs Changes	0s
Build ARM64 (GHCR Only)	0s
Build Dev ECR	0s
Migrate Dev DB	0s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	50s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 8s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	45s
Process Docs	-1s
Create GHCR Manifests	-1s
Create GitHub Release	0s
	11m 42s

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