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When built with the Tailscale Go toolchain, include the toolchain's git revision in the version output. The non-JSON output shows the first 10 hex digits: go version: go1.26.2 (tailscale/go dfe2a5fd8e) The JSON output includes the full hash as "tailscaleGoGitHash", or omits the field when not using tsgo. The toolchain rev is read via a separate sync.OnceValue rather than piggybacking on getEmbeddedInfo, because that function discards all data when VCS fields are absent (e.g. in test binaries), while the tailscale.toolchain.rev setting is still present. Also add a CI-only test verifying tailscaleToolchainRev is non-empty when built with the tailscale_go build tag. Fixes #19374 Change-Id: Ied0b16d7aead5471d8c614c30cba8b0dcf80c691 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>