Add Version to /healthz endpoint

[nitrocode]

Closes #1119

[lkysow]

Sorry, one more change to use snake_case.

Also I missed this but we talked about it being on /status not /healthz

[nitrocode]

Hm I'd like to put the changes in the StatusController and see this file but it doesn't have access to the Server. How would I go about moving these changes from the /healthz endpoint to the /status endpoint?

atlantis/server/status_controller.go

Line 24 in 909723f

func (d *StatusController) Get(w http.ResponseWriter, r *http.Request) {

Sorry. I'm a bit of a golang noob.

[lkysow]

No worries, so you'll need to add AtlantisVersion string as a field on the StatusController struct. Then pass it in in server/server.go where it's instantiated:

	statusController := &StatusController{
		Logger:  logger,
		Drainer: drainer,
		AtlantisVersion: config.AtlantisVersion,
	}

The in the status_controller it will be available on the struct pointer, e.g.

	data, err := json.MarshalIndent(&StatusResponse{
		ShuttingDown:  status.ShuttingDown,
		InProgressOps: status.InProgressOps,
		AtlantisVersion: d.AtlantisVersion,
	}, "", "  ")

[github-actions]

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