Add orchestration enrollment samples

AspireOrchestratorEnrollment/PreEnrollmentApp/OnlineShop.Web/Components/Pages/Error.razor

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+@page "/Error"
+@using System.Diagnostics
+
+<PageTitle>Error</PageTitle>
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (ShowRequestId)
+{
+    <p>
+        <strong>Request ID:</strong> <code>@requestId</code>
+    </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+    Swapping to <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+    It can result in displaying sensitive information from exceptions to end users.
+    For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+    and restarting the app.
+</p>
+
+@code{
+    [CascadingParameter]
+    public HttpContext? HttpContext { get; set; }
+
+    private string? requestId;
+    private bool ShowRequestId => !string.IsNullOrEmpty(requestId);
+
+    protected override void OnInitialized()
+    {
+        requestId = Activity.Current?.Id ?? HttpContext?.TraceIdentifier;
+    }
+}

AspireOrchestratorEnrollment/PreEnrollmentApp/OnlineShop.Web/Components/Pages/Home.razor

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+@page "/"
+@using OnlineShop.Web.Dtos
+@attribute [StreamRendering(true)]
+@attribute [OutputCache(Duration = 5)]
+
+@inject ProductsApiClient ProductsApi
+
+<PageTitle>Products</PageTitle>
+
+<h1>Products</h1>
+
+@if (products == null)
+{
+    <p><em>Loading...</em></p>
+}
+else
+{
+    <table class="table">
+        <thead>
+            <tr>
+                <th>Name</th>
+                <th>Price (USD)</th>
+                <th>Summary</th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var product in products)
+            {
+                <tr>
+                    <td>@product.Title</td>
+                    <td>@product.Price</td>
+                    <td>@product.Summary</td>
+                </tr>
+            }
+        </tbody>
+    </table>
+}
+
+@code {
+    private ProductDto[]? products;
+
+    protected override async Task OnInitializedAsync()
+    {
+        products = await ProductsApi.GetProductsAsync();
+    }
+}
+