Maya: Validate setdress top group

[davidlatwe]

Feature

When publishing setdress in Maya, top group node will be checked if it's part of publishing content.

What does that mean ?
Say you have these in Maya outliner, 4 loaded models all parented under one top group node:

forestSet_GRP
    + Foo_01:modelMain
    + Foo_02:modelMain
    + Bar_01:modelMain
    + Bar_02:modelMain

And you created two setdress instances for publish :

setdressFoo
    + Foo_01:modelMain
    + Foo_02:modelMain

setdressBar
    + Bar_01:modelMain
    + Bar_02:modelMain

Without this new feature, the top group node and all it's child nodes will be published together. Which means all those 4 models will be in both setdressFoo and setdressBar subsets.

Now with this PR, the unexpected result in above example will not happen.

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Resolves client ticket PYPE-1395

[mkolar]

Task linked: PYPE-1395 Validate setdress top group