chore(backend): add roslynator and fix diagnostics

Foxnouns.Backend/Utils/PatchRequest.cs

@@ -5,10 +5,11 @@ using Newtonsoft.Json.Serialization;
 namespace Foxnouns.Backend.Utils;
 
 /// <summary>
-/// A base class used for PATCH requests which stores information on whether a key is explicitly set to null or not passed at all.
-///
+/// <para>A base class used for PATCH requests which stores information on whether a key is explicitly set to null or not passed at all.</para>
+/// <para>
 /// HasProperty() should not be used for properties that cannot be set to null--a null value should be treated
 /// as an unset value in those cases.
+/// </para>
 /// </summary>
 public abstract class PatchRequest
 {

Foxnouns.Backend/Utils/ValidationUtils.Strings.cs

@@ -63,7 +63,10 @@ public static partial class ValidationUtils
                 string.Equals(u, username, StringComparison.InvariantCultureIgnoreCase)
             )
         )
+        {
             return ValidationError.GenericValidationError("Username is not allowed", username);
+        }
+
         return null;
     }
 
@@ -89,7 +92,10 @@ public static partial class ValidationUtils
                 string.Equals(u, memberName, StringComparison.InvariantCultureIgnoreCase)
             )
         )
+        {
             return ValidationError.GenericValidationError("Name is not allowed", memberName);
+        }
+
         return null;
     }