V9: Allowlisting remote URLs for displaying content on the content dashboard (#11825)

* Fixing ContentDashboardSettings to work when set in the config

* Moving file in Models folder and adding ContentDashboardUrlAllowlist setting

* Implementing allowlist for content dashboard base url

* Cleanup

* Error msg vs log msg

src/Umbraco.Core/Configuration/Models/ContentDashboardSettings.cs

@@ -0,0 +1,35 @@
+using System.ComponentModel;
+
+namespace Umbraco.Cms.Core.Configuration.Models
+{
+    /// <summary>
+    /// Typed configuration options for content dashboard settings.
+    /// </summary>
+    [UmbracoOptions(Constants.Configuration.ConfigContentDashboard)]
+    public class ContentDashboardSettings
+    {
+        private const string DefaultContentDashboardPath = "cms";
+
+        /// <summary>
+        /// Gets a value indicating whether the content dashboard should be available to all users.
+        /// </summary>
+        /// <value>
+        ///     <c>true</c> if the dashboard is visible for all user groups; otherwise, <c>false</c>
+        ///     and the default access rules for that dashboard will be in use.
+        /// </value>
+        public bool AllowContentDashboardAccessToAllUsers { get; set; } = true;
+
+        /// <summary>
+        /// Gets the path to use when constructing the URL for retrieving data for the content dashboard.
+        /// </summary>
+        /// <value>The URL path.</value>
+        [DefaultValue(DefaultContentDashboardPath)]
+        public string ContentDashboardPath { get; set; } = DefaultContentDashboardPath;
+
+        /// <summary>
+        /// Gets the allowed addresses to retrieve data for the content dashboard.
+        /// </summary>
+        /// <value>The URLs.</value>
+        public string[] ContentDashboardUrlAllowlist { get; set; }
+    }
+}