fix(enums): add missing GraphErrorCode values (#1078)

Co-authored-by: Gavin Barron <gavin.barron@gmail.com>

Author: AndrewShchetkin

src/Microsoft.Graph/Enums/GraphErrorCode.cs

@@ -48,6 +48,8 @@ public enum GraphErrorCode
         InvalidRequest,
         /// Invalid start index.
         InvalidStartIndex,
+        /// The image could not be found.
+        ImageNotFound,
         /// The resource could not be found.
         ItemNotFound,
         /// Lock token does not match existing lock.
@@ -78,6 +80,8 @@ public enum GraphErrorCode
         NameAlreadyExists,
         /// The action is not allowed by the system.
         NotAllowed,
+        /// The requested item is not found.
+        NotFound,
         /// The request is not supported by the system.
         NotSupported,
         /// Parameter Exceeds Maximum Length.
@@ -90,6 +94,8 @@ public enum GraphErrorCode
         PathTooDeep,
         /// Property not updateable.
         PropertyNotUpdateable,
+        /// The requested resource is not found.
+        Request_ResourceNotFound,
         /// The resource being updated has changed since the caller last read it, usually an eTag mismatch.
         ResourceModified,
         /// Resync required. Replace any local items with the server's version (including deletes)