Reland `go_shim`, replacing `go` runner by SDK's raw `go` #20538

Job	Run time
review / Gate	3s
review / Prepare	0s
review / Review (Codex)	0s
review / Review (Gemini)	0s
review / Review (Claude)	0s
review / Acknowledge request	0s
review / Post review	0s
review / Finalize request signal	0s
	3s

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