V8: Fix YSODs when moving and copying things in the Settings section

[kjac]

Prerequisites

• I have added steps to test this contribution in the description below

Description

TL;DR the enum MoveOperationStatusType must be of type byte, otherwise most move and copy operations appear to fail miserably in the UI.

When moving and copying things around in the Settings section, you're usually given this response:

The exception message is:

System.InvalidOperationException: Enum Umbraco.Core.Services.MoveOperationStatusType underlying type is not <byte>.

The move/copy operation actually succeeds, but the success message just doesn't work 😐 because MoveOperationStatusType is not of type byte:

[zpqrtbnk]

OperationResultType does indeed specify in comments

// all "ResultType" enums must be byte-based, and declare Failed = 128, and declare
// every failure codes as >128 - see OperationResult and OperationResultType for details.

so MoveOperationStatusType should be named MoveOperationResultType and be byte-based.

merging - thanks!