Update all built-in AuthenticationSchemeOptions to initialize Events

src/Security/Authentication/Certificate/src/CertificateAuthenticationOptions.cs

@@ -10,6 +10,14 @@ namespace Microsoft.AspNetCore.Authentication.Certificate;
 /// </summary>
 public class CertificateAuthenticationOptions : AuthenticationSchemeOptions
 {
+    /// <summary>
+    /// Initializes a new instance of <see cref="CertificateAuthenticationOptions"/>.
+    /// </summary>
+    public CertificateAuthenticationOptions()
+    {
+        Events = new CertificateAuthenticationEvents();
+    }
+
     /// <summary>
     /// Value indicating the types of certificates accepted by the authentication middleware.
     /// </summary>

src/Security/Authentication/JwtBearer/src/JwtBearerOptions.cs

@@ -32,6 +32,7 @@ public JwtBearerOptions()
         SecurityTokenValidators = new List<ISecurityTokenValidator> { _defaultHandler };
 #pragma warning restore CS0618 // Type or member is obsolete
         TokenHandlers = new List<TokenHandler> { _defaultTokenHandler };
+        Events = new JwtBearerEvents();
     }
 
     /// <summary>

src/Security/Authentication/Negotiate/src/NegotiateOptions.cs

@@ -8,6 +8,14 @@ namespace Microsoft.AspNetCore.Authentication.Negotiate;
 /// </summary>
 public class NegotiateOptions : AuthenticationSchemeOptions
 {
+    /// <summary>
+    /// Initializes a new instance of <see cref="NegotiateOptions"/>.
+    /// </summary>
+    public NegotiateOptions()
+    {
+        Events = new NegotiateEvents();
+    }
+
     /// <summary>
     /// The object provided by the application to process events raised by the negotiate authentication handler.
     /// The application may use the existing NegotiateEvents instance and assign delegates only to the events it