MM-21102: Add ExperimentalSettings.UseNewSAMLLibrary to diagnostics (#13543)

* add UseNewSAMLLibrary to diagnostics.go

* add UseNewSAMLLibrary to diagnostics.go

* add TRACK_CONFIG_EXPERIMENTAL to expected results

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/diagnostics_test.go

@@ -163,6 +163,7 @@ func TestDiagnostics(t *testing.T) {
 			TRACK_CONFIG_METRICS,
 			TRACK_CONFIG_SUPPORT,
 			TRACK_CONFIG_NATIVEAPP,
+			TRACK_CONFIG_EXPERIMENTAL,
 			TRACK_CONFIG_ANALYTICS,
 			TRACK_CONFIG_PLUGIN,
 			TRACK_ACTIVITY,