fix(ooniprobe): use ooniprobe-cli-unattended for unattended runs (#714)

This diff changes the software name used by unattended runs for which
we did not override the default software name (`ooniprobe-cli`).

It will become `ooniprobe-cli-unattended`. This software name is in line
with the one we use for Android, iOS, and desktop unattended runs.

While working in this diff, I introduced string constants for the run
types and a string constant for the default software name.

See https://github.com/ooni/probe/issues/2081.

internal/model/ooapi.go

@@ -16,7 +16,7 @@ type OOAPICheckInConfig struct {
 	Platform        string                            `json:"platform"`         // Platform of the probe
 	ProbeASN        string                            `json:"probe_asn"`        // ProbeASN is the probe country code
 	ProbeCC         string                            `json:"probe_cc"`         // ProbeCC is the probe country code
-	RunType         string                            `json:"run_type"`         // RunType
+	RunType         RunType                           `json:"run_type"`         // RunType
 	SoftwareName    string                            `json:"software_name"`    // SoftwareName of the probe
 	SoftwareVersion string                            `json:"software_version"` // SoftwareVersion of the probe
 	WebConnectivity OOAPICheckInConfigWebConnectivity `json:"web_connectivity"` // WebConnectivity class contain an array of categories

internal/model/runtype.go

@@ -0,0 +1,14 @@
+package model
+
+// RunType describes the type of a ooniprobe run.
+type RunType string
+
+const (
+	// RunTypeManual indicates that the user manually run `ooniprobe run`. Command
+	// line tools such as miniooni should always use this run type.
+	RunTypeManual = RunType("manual")
+
+	// RunTypeTimed indicates that the user run `ooniprobe run unattended`, which
+	// is the correct way to run ooniprobe from scripts and cronjobs.
+	RunTypeTimed = RunType("timed")
+)