log: Simplify Debug et al to accept single argument only

The functions `Debug()`, `Info()` and related accept multiple arguments.
The first hunch would be that the logger would format those arguments
via a call to `fmt.Sprintf()`, and that's seemingly also the assumption
that many of our callsites had. But in fact, the logrus logger will call
`fmt.Sprint()`, which joins the arguments by spaces when neither of the
arguments is a string.

While not being obvious, the current definition also conflicts with the
`slog` package. While the respective functions there also accept a
variable number of arguments, they will instead be interpreted as key
value pairs of structured data.

Let's simplify our calling conventions such that the functions only
accept a single message parameter and adjust callsites that misused
these functions accordingly. This fixes a source of misformatted log
messages and prepares us for the conversion to the `slog` package.

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