Make it possible to specify the profile when using kaocha.repl

[plexus]

Currently we look up the profile directly in :kaocha/cli-options, so there's no good way to specify it in scenarios where we're not running via kaocha.runner.

This is probably also an issue with -X, but that's less important since people using -X should migrate to -m if they need that.

For starters we can simply look for a :profile key in the extra-config and kaocha.repl/config and use that.