fix: restore len(warnings) > 0 guard in ApisixConsumer webhook

When auth secret references are missing, the ApisixConsumer translator
cannot produce valid auth credentials — ADC validation would always fail
in that state, causing admission denial instead of a warning. Restore the
guard so that missing secrets produce a warning but still admit the resource.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: AlinsRan

internal/webhook/v1/apisixconsumer_webhook.go

@@ -75,8 +75,7 @@ func (v *ApisixConsumerCustomValidator) ValidateCreate(ctx context.Context, obj
 	}
 
 	warnings := v.collectWarnings(ctx, consumer)
-	if v.initErr != nil {
-		apisixConsumerLog.Error(v.initErr, "ADC validator init failed, skipping ADC validation")
+	if v.initErr != nil || len(warnings) > 0 {
 		return warnings, nil
 	}
 	return warnings, v.adcValidator.Validate(ctx, consumer)
@@ -93,8 +92,7 @@ func (v *ApisixConsumerCustomValidator) ValidateUpdate(ctx context.Context, oldO
 	}
 
 	warnings := v.collectWarnings(ctx, consumer)
-	if v.initErr != nil {
-		apisixConsumerLog.Error(v.initErr, "ADC validator init failed, skipping ADC validation")
+	if v.initErr != nil || len(warnings) > 0 {
 		return warnings, nil
 	}
 	return warnings, v.adcValidator.Validate(ctx, consumer)