cmd/go: avoid passing testing.T to isCaseSensitive and goVersion

The previous implementation of isCaseSensitive called t.Fatalf in the
wrong place, causing tests after the first to proceed past an error
determining case-sensitivity. That could lead to confusing errors.

(Moreover, I would like to try to disentangle the script engine from
testing.T so that I can also use it to generate serving contents in
the replacement for vcs-test.golang.org.)

The implementation of goVersion called ts.fatalf, which is probably
fine but prevents the script environment from being computed outside
of a test, as we might want to do for debugging and other scripting.

For #27494.

Change-Id: Ibfee0704523fdcd6174b544ff84267216435025b
Reviewed-on: https://go-review.googlesource.com/c/go/+/419874
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>

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