Replace logrus with log/slog

[uhthomas]

Given the release of log/slog, it would be nice to replace logrus with it. There isn't really a great standard for logging in this repository, so this could also be considered a feature request for better logging in general.

I found it hard to add new log lines when working on #1887.

[matt0x6F]

I'm okay with this change, I think it would be a step in the right direction since Logrus is in maintenance mode. There's some specialized field renaming that happens with CloudRuntime that we'd need to accommodate but I think everything else is pretty straight forward.