feat(app): add the capability to enable/disable host management features (#2472)

* feat(settings): add the capability to enable/disable the host management features

* feat(settings): remove the validation of EnableHostManagementFeatures in frontend

* feat(api): disable schedules API when HostManagementFeatures is false + DB migration

* style(settings): update host management settings tooltip

* refacot(schedules): update DBVersion to 15

api/http/handler/settings/settings_update.go

@@ -18,6 +18,7 @@ type settingsUpdatePayload struct {
 	LDAPSettings                       *portainer.LDAPSettings
 	AllowBindMountsForRegularUsers     *bool
 	AllowPrivilegedModeForRegularUsers *bool
+	EnableHostManagementFeatures       *bool
 	SnapshotInterval                   *string
 	TemplatesURL                       *string
 }
@@ -76,6 +77,10 @@ func (handler *Handler) settingsUpdate(w http.ResponseWriter, r *http.Request) *
 		settings.AllowPrivilegedModeForRegularUsers = *payload.AllowPrivilegedModeForRegularUsers
 	}
 
+	if payload.EnableHostManagementFeatures != nil {
+		settings.EnableHostManagementFeatures = *payload.EnableHostManagementFeatures
+	}
+
 	if payload.SnapshotInterval != nil && *payload.SnapshotInterval != settings.SnapshotInterval {
 		err := handler.updateSnapshotInterval(settings, *payload.SnapshotInterval)
 		if err != nil {