Build and Test Go Project

Change role from "system" to "user" in prompt messages for `AssignCodingAgentPrompt` and `IssueToFixWorkflowPrompt` #2514

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Run time

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Job	Run time
build (windows-latest)	50s
build (ubuntu-latest)	1m 2s
build (macos-latest)	1m 12s
	3m 4s