Record comment/post removals of banned users in modlog

[Azzurite]

Requirements

• Is this a feature request? For questions or discussions use https://lemmy.ml/c/lemmy_support
• Did you check to see if this issue already exists?
• Is this only a feature request? Do not put multiple feature requests in one issue.
• Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.
• Do you agree to follow the rules in our Code of Conduct?

Is your proposal related to a problem?

There is an option in the UI to remove the content of a user when you ban them from a community. Those removals currently happen silently, they are not recorded in the mod log, only the banning of the user is visible.

Describe the solution you'd like.

All removed comments and posts through banning the user should be recorded in the mod log as if they were removed independently.

Describe alternatives you've considered.

Leaving it like this? I don't know, why is this field required? :D

Additional context

Currently, there is no way to audit the ban of a user via the mod log if you use the option to delete their posts. It's simply impossible (at least through the UI, dunno if there is another way) to find out what they were banned for exactly, and see if the mod's actions were correct or not.