cmd/go/internal/modfetch: add zip sums and hashes to TestCodeRepo
cmd/go/internal/modfetch: add zip sums and hashes to TestCodeRepo

Updates #35290

Change-Id: I09cad17f09e78c2bf6a9de98b01f13ed383ca006
Reviewed-on: https://go-review.googlesource.com/c/go/+/204643
Run-TryBot: Jay Conrod <f3fadaedc813344da5ec13b41e26596889cc5baa@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>

nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,akutz/go,nawawi/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,CAFxX/go,akutz/go,CAFxX/go,cloudflare/go,golang/go,cloudflare/go,akutz/go,golang/go,golang/go,nawawi/go,nawawi/go,CAFxX/go,CAFxX/go,CAFxX/go,cloudflare/go,akutz/go,golang/go,CAFxX/go,golang/go,nawawi/go,golang/go,akutz/go,cloudflare/go,cloudflare/go,akutz/go,cloudflare/go,nawawi/go,akutz/go,akutz/go