Remove support for passing the -workfile flag now that the go command no
longer supports it.
Updates #51215
Change-Id: I95d73fb1a3a6d9bcfaaae5e22e44722118d12c03
Reviewed-on: https://go-review.googlesource.com/c/tools/+/386536
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>