Fix cube crash when requesting columns

[shangyian]

Summary

Querying a cube for both columns { displayName } and cubeMetrics { name } (or cubeDimensions { name }) crashed with '_RawColumn' object has no attribute 'display_name':

  { findNodes(...) { current { columns { displayName } cubeMetrics { name } } } }

This is because the name-only cube fast path replaces current.columns with lightweight _RawColumn stand-ins to skip ORM hydration, but the predicate that gated the optimization only looked at the cube subfields, so a query that also requested full columns data still took the fast path and overwrote the real columns with the bare stand-ins.

The predicate now also check for columns / primaryKey at the same selection level, so the fast path is skipped whenever the client needs the real column data.

Test Plan

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Deployment Plan

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