fix(slack): remove stale preview gate references #28732

Job	Run time
Test and Build / Build App	5m 1s
Test and Build / Lint and Test	8m 6s
Build ARM64 (GHCR Only)	0s
Build Dev ECR	0s
Migrate Dev DB	0s
Build AMD64	0s
Deploy Trigger.dev (Dev)	0s
Check Docs Changes	0s
Detect Desktop Changes	0s
Check Desktop Signing Secrets	0s
Create Desktop Prerelease	-1s
Desktop Prerelease Build	-1s
Publish Desktop Prerelease	-1s
Prune Desktop Prereleases	0s
Detect Version	-10s
Migrate DB	-1s
Create GHCR Manifests	0s
Promote Images	-1s
Process Docs	0s
Create GitHub Release	0s
Desktop Release	0s
	12m 52s

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