Avoid logging the same entity operations twice

Problem/Motivation

There is a possibility that certain entities will have their update operations tracked e.g. "Block" config entities.

We should have checks in place to make sure we only log the operation once.

The config schema for the module also needs some normalizing.

Steps to reproduce

Enable support for the "Block" config entity in /admin/config/events_logging.

Go into "Block layout" in Drupal and resave any of the existing blocks.

You should now see two update operations for the same block.

Proposed resolution

Prevent updates to the entity. And ensure that config schema definitions are cleaner and more manageable (keeping only enabled values).

Remaining tasks

Provide issue fork/patch.

User interface changes

N/A

API changes

N/A

Data model changes

N/A