It was noticed during another PR review
https://github.com/KhronosGroup/OpenCL-CTS/pull/2207/files#r1903921283
that there
was a case where the return value of a `Skip()` check was ignored, this
is fixed in this PR.
I've also tracking down occurrences of derived class overriding the
`Skip()` test fixture method, but not calling the parents class `Skip()`
check inside of the method. I believe omitting this parent skip check
wasn't intentional, it's clearer to explicitly respect the parent
classes skip conditions, even if we've got away with not needing too due
to the way the derived class skip conditions have been defined.
bc5b0215ee