Skip checking stack frames in evaluator expect tests (#2008)

It used to be that we avoided noise in the evaluator tests during
libraries edits by avoiding having spans from the stdlib show up in
there, but newer tests include calls to `Std.Intrinsic.I` that need
spans updated every time something alphabetically above that operation
changes in the stdlib. This change updates the expect call on failure to
only verify the error and not the stack frames, as call stacks are
already verified in other tests and don't need to be checked here.