Roy Frostig 19d3d954bf unify stages.Executable and stages.XlaExecutable
We no longer have many different implicit types conforming to `Executable`, only `pxla.MeshExectuable` and `pxla.PmapExecutable`. Both are `XlaExecutable` subtypes. So define just one common base class, call it `Exectuable`, and inherit from just that in both concrete internal executable subtypes.

PiperOrigin-RevId: 746706712
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