Update the `HandleValidateAddAndUpdateResponse` in the `ListItem` to pass on the error code and error message if present

[Adam-it]

That is some good question and feedback.
I think the problem is that here

pnpcore/src/sdk/PnP.Core/Model/SharePoint/Core/Internal/ListItem.cs

Lines 190 to 217 in 07bd476

	private void HandleValidateAddAndUpdateResponse(JsonElement field, JsonElement value, string fieldName, Guid batchRequestId)
	{
	// In some cases SharePoint will return HTTP 200 indicating the list item was added ok, but one or more fields could
	// not be added which is indicated via the HasException property on the field. If so then throw an error.
	if (field.TryGetProperty("HasException", out JsonElement hasExceptionProperty) && hasExceptionProperty.GetBoolean() == true)
	{
	bool handled = false;
	if (batchRequestId != Guid.Empty)
	{
	var actualBatch = PnPContext.BatchClient.GetBatchByBatchRequestId(batchRequestId);
	if (!actualBatch.ThrowOnError)
	{
	// Add error to used batch
	actualBatch.AddBatchResult(actualBatch.GetRequest(batchRequestId),
	System.Net.HttpStatusCode.OK,
	value.ToString(),
	new SharePointRestError(ErrorType.SharePointRestServiceError, (int)System.Net.HttpStatusCode.OK, string.Format(PnPCoreResources.Exception_ListItemAdd_WrongInternalFieldName, fieldName)));
	handled = true;
	}
	}
	if (!handled)
	{
	throw new SharePointRestServiceException(string.Format(PnPCoreResources.Exception_ListItemAdd_WrongInternalFieldName, fieldName));
	}
	}
	}

We just read the HasException and handle the error but we do not parse and pass one the error code and error message.
What we could do is:

• Read ErrorCode (int) and ErrorMessage (string) from the field JsonElement
• Construct a SharePointRestError with those details (or pass them into the message)

based on: #1760