SessionManager should not directly query the sessions table

Problem/Motivation

Found in 📌 Implement lazy database creation for sessions Active .

SessionManager::delete() directly queries the sesssions table, but the session handler is swappable, so if you don't use database sessions, it's going to run a query on an empty table.

I think we could implement a new interface on SessionHandler, something like 'DeleteByUserIdSessionInterface' with a ::deleteByUserId($uid) method, then check that interface and call the method instead from SessionManager.

That way alternative session implementations will actually be able to delete all sessions for a user too if they're able to.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet