[release-branch.go1.21] cmd/go/internal/toolchain: apply the -modcacherw flag when downloading a module to determine what toolchain it needs

Fixes #64497.
Updates #64282.

Change-Id: I3f211c599ee70cb58254d0bc07eeb3c135124e58
Reviewed-on: https://go-review.googlesource.com/c/go/+/555436
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
(cherry picked from commit cc38c68ae09fa591697a4239a7dedd2efe386995)
Reviewed-on: https://go-review.googlesource.com/c/go/+/559198
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2 files changed
tree: 1b9b3accaad330505ae9831a0af820664a50a6c3
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
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