Disable //tests/core/cgo:race_test on Windows (#2940)
Disable //tests/core/cgo:race_test on Windows (#2940)

Disables a test that fails on Windows due to an unfixed upstream bug in Go. See https://buildkite.com/bazel/rules-go-golang/builds/3158#c8bfc9aa-f9e7-4c3e-9b47-1332ab952b76

Which issues(s) does this PR fix?

Fixes #2911.

Other notes for review
bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go