fixup! feat: Add preflight checks framework

Add unit tests

Author: dlipovetsky

pkg/webhook/preflight/preflight.go

@@ -99,8 +99,6 @@ func (h *WebhookHandler) Handle(ctx context.Context, req admission.Request) admi
 
 	// Run all checks and collect results.
 	resultCh := make(chan CheckResult, len(checks))
-	defer close(resultCh)
-
 	wg := &sync.WaitGroup{}
 	for _, check := range checks {
 		wg.Add(1)
@@ -111,6 +109,7 @@ func (h *WebhookHandler) Handle(ctx context.Context, req admission.Request) admi
 		}(ctx, check)
 	}
 	wg.Wait()
+	close(resultCh)
 
 	for result := range resultCh {
 		if result.Error {