feat(triggers): add Resend webhook triggers with auto-registration (#… #13695

Job	Run time
Detect Version	4s
Test and Build / Test and Build	4m 12s
Check Docs Changes	0s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	4m 48s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	6m 30s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	2m 32s
Build ARM64 (GHCR Only)	0s
Create GHCR Manifests	-1s
Process Docs	-1s
Create GitHub Release	0s
	18m 4s

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