fix(Notification): allow undefined props in TypeScript (#15068)

Co-authored-by: Taylor Jones <tay1orjones@users.noreply.github.com>

Author: lewandom

packages/react/src/components/Notification/Notification.tsx

@@ -336,7 +336,7 @@ export interface ToastNotificationProps extends HTMLAttributes<HTMLDivElement> {
   /**
    * Specify what state the notification represents
    */
-  kind:
+  kind?:
     | 'error'
     | 'info'
     | 'info-square'
@@ -357,13 +357,13 @@ export interface ToastNotificationProps extends HTMLAttributes<HTMLDivElement> {
   /**
    * Provide a function that is called when the close button is clicked
    */
-  onCloseButtonClick(event: MouseEvent): void;
+  onCloseButtonClick?(event: MouseEvent): void;
 
   /**
    * By default, this value is "status". You can also provide an alternate
    * role if it makes sense from the accessibility-side
    */
-  role: 'alert' | 'log' | 'status';
+  role?: 'alert' | 'log' | 'status';
 
   /**
    * Provide a description for "status" icon that can be read by screen readers
@@ -612,7 +612,7 @@ export interface InlineNotificationProps
   /**
    * Specify what state the notification represents
    */
-  kind:
+  kind?:
     | 'error'
     | 'info'
     | 'info-square'
@@ -633,13 +633,13 @@ export interface InlineNotificationProps
   /**
    * Provide a function that is called when the close button is clicked
    */
-  onCloseButtonClick(event: MouseEvent): void;
+  onCloseButtonClick?(event: MouseEvent): void;
 
   /**
    * By default, this value is "status". You can also provide an alternate
    * role if it makes sense from the accessibility-side.
    */
-  role: 'alert' | 'log' | 'status';
+  role?: 'alert' | 'log' | 'status';
 
   /**
    * Provide a description for "status" icon that can be read by screen readers
@@ -859,7 +859,7 @@ export interface ActionableNotificationProps
   /**
    * Specify what state the notification represents
    */
-  kind:
+  kind?:
     | 'error'
     | 'info'
     | 'info-square'
@@ -886,7 +886,7 @@ export interface ActionableNotificationProps
   /**
    * Provide a function that is called when the close button is clicked
    */
-  onCloseButtonClick(event: MouseEvent): void;
+  onCloseButtonClick?(event: MouseEvent): void;
 
   /**
    * By default, this value is "alertdialog". You can also provide an alternate