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search: compute result types without mutating args

Warren Gifford requested to merge backend-integration/rvt/rts into main

Created by: rvantonder

Stacked on https://github.com/sourcegraph/sourcegraph/pull/32593.

This PR creates a pure function to compute result types from args without mutating args. It's possible now because no state leaks to any part of our app outside of these functions.

The end goal is to compute result types without args at all, and just use the minimal state from query and such, instead of "routing" state through TextPatternInfo. This is part of a bunch of simplifications in job construction for optimizing queries.

Test plan

Semantics-preserving.

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