go: what to name a target's field for enabling Go data race detector

[tdyas]

I would like feedback on what to name a new field on various Go target types to enable the Go data race detector. Relevant PR is #17510.

Bazel rules_go just uses race for the name of their equivalent concept.

Some proposals:

• race
• with_race
• with_race_detector

And test-only variants (used for go_package to influence test binaries):

• test_race
• test_with_race
• test_with_race_detector

[tdyas]

Ended up calling the field race.