cmd/go: go.work outside /src directory is not respected in /src

[hyangah]

What version of Go are you using (go version)?

$ pwd
/Users/hakim/go_tip/go/src 
$ ../bin/go version
go version devel go1.19-fd653913be Thu Mar 31 13:59:09 2022 -0400 darwin/amd64

What did you do?

$  cat ../go.work
go 1.18

use (
	./src
	./src/cmd
)
$ ../bin/go env GOWORK GOROOT

/Users/hakim/go_tip/go
$ ../bin/go list -m
std

What did you expect to see?

go.work is respected.

What did you see instead?

go.work outside std is not respected.

cc @matloob @bcmills

[gopherbot]

Change https://go.dev/cl/398634 mentions this issue: cmd/go: ignore go.work in $TMPDIR instead of $GOROOT