Fix BlazorServer Identity templates (#25456)

Remove @using Microsoft.AspNetCore.Components.Web.Virtualization in blazorserver template.

Author: John Luo

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/.template.config/template.json

@@ -26,6 +26,31 @@
   "sources": [
     {
       "modifiers": [
+        {
+          "condition": "(!OrganizationalAuth && !IndividualAuth)",
+          "exclude": [
+            "Areas/Identity/Pages/Shared/_LoginPartial.Identity.cshtml",
+            "Areas/Identity/Pages/Shared/_LoginPartial.OrgAuth.cshtml"
+          ]
+        },
+        {
+          "condition": "(OrganizationalAuth || IndividualB2CAuth)",
+          "rename": {
+            "Areas/Identity/Pages/Shared/_LoginPartial.OrgAuth.cshtml": "Areas/Identity/Pages/Shared/_LoginPartial.cshtml"
+          },
+          "exclude": [
+            "Areas/Identity/Pages/Shared/_LoginPartial.Identity.cshtml"
+          ]
+        },
+        {
+          "condition": "(IndividualLocalAuth)",
+          "rename": {
+            "Areas/Identity/Pages/Shared/_LoginPartial.Identity.cshtml": "Areas/Identity/Pages/Shared/_LoginPartial.cshtml"
+          },
+          "exclude": [
+            "Areas/Identity/Pages/Shared/_LoginPartial.OrgAuth.cshtml"
+          ]
+        },
         {
           "condition": "(!IndividualLocalAuth || UseLocalDB)",
           "exclude": [
@@ -131,7 +156,6 @@
         {
           "condition": "(!GenerateApi)",
             "exclude": [
-              "Services/DownstreamWebApi.cs",
               "Pages/CallWebApi.razor"
             ]
         },

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Areas/Identity/Pages/Shared/_LoginPartial.Identity.cshtml

@@ -0,0 +1,27 @@
+@using Microsoft.AspNetCore.Identity
+@inject SignInManager<IdentityUser> SignInManager
+@inject UserManager<IdentityUser> UserManager
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+
+<ul class="navbar-nav">
+@if (SignInManager.IsSignedIn(User))
+{
+    <li class="nav-item">
+        <a  class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Manage/Index" title="Manage">Hello @User.Identity.Name!</a>
+    </li>
+    <li class="nav-item">
+        <form class="form-inline" asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="/" method="post">
+            <button  type="submit" class="nav-link btn btn-link text-dark">Logout</button>
+        </form>
+    </li>
+}
+else
+{
+    <li class="nav-item">
+        <a class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Register">Register</a>
+    </li>
+    <li class="nav-item">
+        <a class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Login">Login</a>
+    </li>
+}
+</ul>

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Areas/Identity/Pages/Shared/_LoginPartial.cshtml renamed to src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/Areas/Identity/Pages/Shared/_LoginPartial.OrgAuth.cshtml

@@ -4,7 +4,6 @@
 @using Microsoft.AspNetCore.Components.Forms
 @using Microsoft.AspNetCore.Components.Routing
 @using Microsoft.AspNetCore.Components.Web
-@using Microsoft.AspNetCore.Components.Web.Virtualization
 @using Microsoft.JSInterop
 @using BlazorServerWeb_CSharp
 @using BlazorServerWeb_CSharp.Shared