LPS-45271 It is no longer necessary to have different owner types to represent defaults.

Previously this was necessary to avoid collisions, but since we are now using serviceName as the key for the settings of services and portletId as the key for the settings of portlet instances there is no risk of collisions. Considering this, we think it's better to simplify and reduce the need for extra owner types.
LPS-45271 Remove ownerType parameter because it's no longer necessary as we are always using the same value.
LPS-45273 Refactor SettingsFactoryImpl to increase symmetry and promote reusability
LPS-45273 Rename service settings methods to make more clear that a service is either a company service (like user service) or a group service (like MB Service)

This will be relevant in the next commit when we add a method to retrieve the default settings at the company level for group services.
LPS-45273 Provide API to retrieve and set default settings for portlet instances and services
LPS-45273 Rewrite message of error logs to make it more descriptive
LPS-45273 Update method names in factory util.
LPS-45273 update log message