[Enhance] Remove some unnecessary explicit fields in sample CR higresscontroller

[Charlie17Li]

Background

There are many unnecessary explicit fields in sample CR :

--- a/config/samples/operator_v1alpha1_higresscontroller.yaml
+++ b/config/samples/operator_v1alpha1_higresscontroller.yaml
@@ -18,24 +18,11 @@ spec:
     image:
       repository: "higress-registry.cn-hangzhou.cr.aliyuncs.com/higress/higress"
       tag: "1.1.0"
-      imagePullPolicy: "IfNotPresent"
     gatewayName: "higress-gateway"
     ingressClass: "higress"
-    sdsTokenAud: "istio-ca"
   pilot:
     name: "pilot"
     image:
       repository: "higress-registry.cn-hangzhou.cr.aliyuncs.com/higress/pilot"
       tag: "1.1.0"
-      imagePullPolicy: "IfNotPresent"
-    env:
-      PILOT_SCOPE_GATEWAY_TO_NAMESPACE: "false"
-      PILOT_ENABLE_METADATA_EXCHANGE: "false"
-      PILOT_ENABLE_CROSS_CLUSTER_WORKLOAD_ENTRY: "false"
-      VALIDATION_ENABLED: "false"
-    traceSampling: "1.0"
-    keepaliveMaxServerConnectionAge: 30m
-    clusterDomain: "cluster.local"
-    oneNamespace: false
-    enableProtocolSniffingForOutbound: true
-    enableProtocolSniffingForInbound: true
+    clusterDomain: "cluster.local"

To get started, we should minimize unnecessary field Settings and we should remove the red parts as much as possible