fix(node): remove deprecated lock details in AuthorityStore

[muXxer]

Description of change

The LockDetails were moved to AuthorityPerEpochStore, but there was some deprecated logic that was necessary in case there were still entries in the old format. I assume we don't need that anymore. We only keep the table in the AuthorityStore to mark live objects.

Links to any relevant issues

#2092

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How the change has been tested

Let's see what the CI says? 😅

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

[alexsporn]

LGTM!