Refine duplicate label checking for embedded selects. Before, we were

coarsely checking for duplicates *anywhere*, e.g.:

select({':a': ['a.cc'], ':b': ['a.cc']}) + select({':a': ['b.cc'], ':b': ['b.cc']})

would fail. But this case is okay because these duplicates are in mutually
exclusive select paths (so they could never appear together anyway).

The new checking logic is:
 - Duplicates can appear in different paths of the same select.
 - Duplicates can *not* appear within the same path of a select.
 - Duplicates can *not* appear across multiple selects (no matter what path -
   this is still stricter than we need to be, but there's no strong case
   for refining this case now).

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MOS_MIGRATED_REVID=93447979

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