cmd/go: `go test -race` does not set implicit `race` build tag [1.19 backport]

[gopherbot]

@bcmills requested issue #54468 to be considered for backport to the next 1.19 minor release.

@gopherbot, please backport to Go 1.19 and 1.18. This is a regression from prior releases that can cause build failures.

[bcmills]

Approved: this is a regression from Go 1.17 that causes previously-valid tests to fail, and the fix is small.

[gopherbot]

Change https://go.dev/cl/426434 mentions this issue: [release-branch.go1.19] cmd/go/internal/imports: include ToolTags in the Tags map

[gopherbot]

Closed by merging 4da9d6a to release-branch.go1.19.