[12.x] Replace logger helper and log function concrete return type ?LogManager with abstract ?LoggerInterface

[abdelrahmenAyman]

Change

Change helper function logger return type to ?LoggerInterface instead of ?LoggerManager. LoggerManager implements LoggerInterface, which means any code expecting a LogManager should still work fine since this is the wider type.

Motivation

The return type was introduced in a recent PR #56684 . Introducing the change to our codebase broke multiple tests where we mocked the logger function using a LoggerInterface mock instance.
Programming for interfaces is a widely accepted practice in the industry, thus the function should be returning an Interface instead of a concrete type to be flexible enough for any more logger classes in the future.

[github-actions]

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