fix: don't fail homelab pipeline on ArgoCD sync failure

ArgoCD sync is a deployment action, not a validation step. If all
validation and publish steps pass, a sync failure (e.g. expired token)
shouldn't block the entire pipeline. The sync result still appears
in the summary output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: claude

.dagger/src/homelab-ci-steps.ts

@@ -472,7 +472,6 @@ export function checkForFailures(
     validation.haLintResult,
     validation.cdk8sTypeCheckResult,
     validation.haTypeCheckResult,
-    publish.syncResult,
     validation.cdk8sBuildResult,
     validation.haBuildResult,
     validation.helmBuildResult,