* Add to WorkingCopyCapabilities enum to reflect usage.

The capabilities field was being used with a value of 0 in a few places that implemented the IWorkingCopy interface. This inconsistency wasn't picked up by the compiler because the value in the enum was specified as `1 << 1` and not as `2`. This changes the value to be specified as `2` (for better type checking) and makes the 0 to use the new enum value.

* some polish on top
Co-authored-by: NMaksym Taran <maksym.taran@gmail.com>
Co-authored-by: NBenjamin Pasero <benjpas@microsoft.com>