refactor: 增加禁用测试

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/Regions.razor

@@ -8,5 +8,5 @@
 <DemoBlock Title="@Localizer["RegionNormalTitle"]"
            Introduction="@Localizer["RegionNormalIntro"]"
            Name="Normal">
-    <Region></Region>
+    <Region IsDisabled="true"></Region>
 </DemoBlock>