When using go 1.18 with go.work files, don't fake workspaces by creating
a workspace module: just run from the workspace root and pass -workfile.
For golang/go#44696
Change-Id: Iaa1979d26b1ce67c6e18e0bf26546a504069da8c
Reviewed-on: https://go-review.googlesource.com/c/tools/+/382241
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>