Add warning when `suppress_if` doesn't have the proper arguments

[jiegillet]

For some reason I thought it needs to be a tuple, so I was attempting:

suppress_if {Constants.solution_deprecated_random_module(), :fail}

which didn't work but also didn't give any hints about why

_Originally posted by @angelikatyborska in https://github.com/exercism/elixir-analyzer/pull/235#discussion_r753801649_