Replace experimental dependency on golang.org/x/exp#4294

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TristonianJones wants to merge 2 commits intoantlr:devfrom

TristonianJones:remove-go-exp

Commits on May 31, 2023

Remove the golang.org/x/exp dependency
TristonianJones
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Additional test helpers for dealing with potentially empty or non-existent files
TristonianJones
committed