improvement(sidebar): prefetch workspace list server-side so the swit… #22382

Job	Run time
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 1s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	4m 6s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	2m 50s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	28s
Test and Build / Build App	2m 59s
Detect Version	4s
Test and Build / Lint and Test	42s
Check Docs Changes	-1s
Build ARM64 (GHCR Only)	-1s
Deploy Trigger.dev (Dev)	-1s
Migrate Dev DB	-9s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	36s
Promote Images	29s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	-1s
	13m 2s

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