perf: remove the list of users under role details (#726)

#### What type of PR is this?

/kind improvement
/milestone 2.0.0-rc.2

#### What this PR does / why we need it:

移除角色详情页面的用户列表，当前后端暂不支持通过角色查询其下用户。

#### Special notes for your reviewer:

None

#### Does this PR introduce a user-facing change?


```release-note
None
```

src/modules/system/roles/RoleDetail.vue

@@ -29,7 +29,7 @@ const { roleTemplateGroups, handleRoleTemplateSelect, selectedRoleTemplates } =
 
 const { formState, saving, handleCreateOrUpdate } = useRoleForm();
 
-const { users } = useUserFetch({ fetchOnMounted: true });
+const { users } = useUserFetch({ fetchOnMounted: false });
 
 watch(
   () => selectedRoleTemplates.value,
@@ -156,7 +156,9 @@ onMounted(() => {
                 {{ formState.metadata?.creationTimestamp }}
               </dd>
             </div>
+            <!-- TODO: 支持通过当前角色查询用户 -->
             <div
+              v-if="false"
               class="bg-gray-50 px-4 py-5 hover:bg-gray-50 sm:grid sm:grid-cols-3 sm:gap-4 sm:px-6"
             >
               <dt class="text-sm font-medium text-gray-900">用户</dt>

src/modules/system/roles/RoleList.vue

@@ -265,7 +265,8 @@ const handleDelete = async (role: Role) => {
                     <VStatusDot v-tooltip="`删除中`" state="warning" animate />
                   </template>
                 </VEntityField>
-                <VEntityField description="0 个用户" />
+                <!-- TODO: 支持显示用户数量 -->
+                <VEntityField v-if="false" description="0 个用户" />
                 <VEntityField>
                   <template #description>
                     <VTag> 系统保留</VTag>