chore(db): drop redundant idx_webhook_on_workflow_id_block_id index (… #17826

Job	Run time
Detect Version	3s
Test and Build / Test and Build	4m 28s
Check Docs Changes	-1s
Build Dev ECR	-1s
Build ARM64 (GHCR Only)	-1s
Migrate Dev DB	-1s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	3m 18s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	43s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 6s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	9m 34s

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