Added test to cover handling of when `CMAKE_OSX_ARCHITECTURES` differs from
OBJECT library target's `OSX_ARCHITECTURES`:

TargetOverrideSingleArch:
- When `CMAKE_OSX_ARCHITECTURES` is set to multiple archs,
- But OBJECT library's `OSX_ARCHITECTURES` is set to single
- Assert that OBJECT library target "`HasKnownObjectFileLocation`" and is
  installable

TargetOverrideMultiArch:
- When `CMAKE_OSX_ARCHITECTURES` is set to single arch,
- But OBJECT library's `OSX_ARCHITECTURES` is set to multiple
- Assert that OBJECT library target does not "`HasKnownObjectFileLocation`"
  and hence not installable