cmd/go: convert tests using testdata/src/syntaxerror to scripts

This includes TestMatchesNoTestsDoesNotOverrideBuildFailure
and TestErrorMessageForSyntaxErrorInTestGoFileSaysFAIL.
Convert the tests that use the testdata/src/syntaxerror directory
to the script framework.

Part of converting all tests to script framework to improve
test parallelism.

Updates #36320
Updates #17751

Change-Id: I2b2b616e8c124996ae8c8e5b737f15bb493ec588
Reviewed-on: https://go-review.googlesource.com/c/go/+/212816


Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>