fix(oauth): coalesce slack token refresh per installation and preserv… #22505

Job	Run time
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII)	2m 28s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	52s
Detect Version	5s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	28s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 57s
Test and Build / Build App	3m 13s
Test and Build / Lint and Test	3m 1s
Build ARM64 (GHCR Only)	0s
Deploy Trigger.dev (Dev)	0s
Migrate Dev DB	-1s
Check Docs Changes	-6s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	41s
Promote Images	17s
Process Docs	0s
Create GitHub Release	0s
Create GHCR Manifests	0s
	16m 55s

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