When CommunityConfiguration is availible and there's a valid value stored we want to use that one as default to generate the backlinks.
Implementation:
It might make sense to move forward with Backlink mark rendering service first, so adding the CommunityConfig can be integrated there.
- Add a method to load the config if available. This can be done by getting the Provider using the ConfigurationProviderFactory from CommunityConfigurations
- Add some sanity check if the value can be used
- Respect the load order on what takes precedence ( see T381465: Investigation: Plan fallbacks for Cite when lacking Community Configuration or cldr )
- Use the configured alphabet in the backlink rendering service