Adds a mechanism to delete CPA values for a given user (#30330)

* Adds a mechanism to delete CPA values for a given user

This requires improving the Property Value service to enable delete
all values for a given target, so a new method was created that allows
to delete filtering by targetType and targetID (required) and
optionally for a specific groupID in case the caller wants to affect
all values for a target (useful in case you remove a post for example
and want to delete all values pointing to that post regardless of the
feature they belong to) or only those that belong to a specific
feature.

* Fix property value tests

* Fix after merge and update method name

* Fix linter

---------

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/custom_profile_attributes.go

@@ -272,3 +272,21 @@ func (a *App) PatchCPAValues(userID string, fieldValueMap map[string]json.RawMes
 
 	return updatedValues, nil
 }
+
+func (a *App) DeleteCPAValues(userID string) *model.AppError {
+	groupID, err := a.CpaGroupID()
+	if err != nil {
+		return model.NewAppError("DeleteCPAValues", "app.custom_profile_attributes.cpa_group_id.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	if err := a.Srv().propertyService.DeletePropertyValuesForTarget(groupID, "user", userID); err != nil {
+		return model.NewAppError("DeleteCPAValues", "app.custom_profile_attributes.delete_property_values_for_user.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	message := model.NewWebSocketEvent(model.WebsocketEventCPAValuesUpdated, "", "", "", nil, "")
+	message.Add("user_id", userID)
+	message.Add("values", map[string]json.RawMessage{})
+	a.Publish(message)
+
+	return nil
+}