logging: pytest should allow users to know why a test was deselected

Especially when using markers and complex testing scenarios, one would endup being surprised that some tests were deselected without a reason.

Very long time ago (3.x), pytest has some code that attempted to provide reason about this but this code was buggy and was removed.

While we might not want to pollute the default console logging, we would want to ensure that when running with -v (or more), decisions about marking tests as deselected are also logged, so users could figure out the likely wrong condition.

@The-Compiler I would like to work on this, but before starting to write any code, it would better to ensure that I am not trying to fix the wrong issue ;)