Check the logging parameters

While reviewing #2728 we noticed that `log/error` wants to have the `Throwable` as first argument. Let's investigate if we have many places where the argument order is not correct and fix them. This same applies to the other `log/xxx` methods.

See [original note](https://github.com/CSCfi/rems/pull/2728#discussion_r711581707).

- [ ] check the argument order of all logging calls and fix any with the incorrect order
- [ ] (optional) make sure all logging calls start with `log/` if they don't (easy to find with grep then)

Start with the logging-call review described in #2728 and the linked discussion. Search the repository for log/ calls, check Throwable-first ordering across the log methods, and identify calls that do not use the log/ prefix. Done means incorrect orders are fixed and, if taking the optional item, all logging calls use the prefix.

Written by the indexing model from the issue text.