Align Interface usage and default implementation sync across services

[ndoschek]

Related to GH-1393
See also comment from Tobias: eclipse-glsp/glsp-client#388 (comment)

This issue aims to extend the pattern of injecting the interface instead of the default class to other services besides the manager classes (e.g., the selection service). Additionally, we need to ensure that interfaces and their corresponding default implementations remain synchronized across all services.

• Review and align interfaces and default implementations for the remaining services.
• Ensure that all public methods/fields in default implementations are reflected in the corresponding interfaces.
• Update injections and bindings to match the pattern.