Convert all Result<..., LemmyError> into LemmyResult<...> Fixes #4613

[dessalines]

Cleanup task to remove all Result<.., LemmyError> into LemmyResult<...>

[Nutomic]

I wonder if there is any way we can show a warning when using LemmyError directly.

[phiresky]

show a warning when using LemmyError directly

It might be possible to not export the type directly?

[dessalines]

Unfortunately LemmyError still required in a few places, namely on some actix::Results.

I've been grepping like rg "LemmyError>" , and there aren't any more ones I can do. Most importantly new copy-pasted code will use this LemmyResult standard.