app/diagnostics: add telemetry for smtp_server_timeout (#14283)

Automatic Merge

app/diagnostics.go

@@ -448,6 +448,7 @@ func (a *App) trackConfig() {
 		"isdefault_login_button_color":         isDefault(*cfg.EmailSettings.LoginButtonColor, ""),
 		"isdefault_login_button_border_color":  isDefault(*cfg.EmailSettings.LoginButtonBorderColor, ""),
 		"isdefault_login_button_text_color":    isDefault(*cfg.EmailSettings.LoginButtonTextColor, ""),
+		"smtp_server_timeout":                  *cfg.EmailSettings.SMTPServerTimeout,
 	})
 
 	a.SendDiagnostic(TRACK_CONFIG_RATE, map[string]interface{}{