Deprecate Foreman::Cast.to_bool

[Dyrkon]

Deprecate Foreman::Cast.to_bool method.

[theforeman-bot]

Can one of the admins verify this patch?

[theforeman-bot]

Can one of the admins verify this patch?

[theforeman-bot]

Can one of the admins verify this patch?

[theforeman-bot]

Issues: #34424

[adamruzicka]

ok to test

[ezr-ondrej]

just FYI there is piece of offline discussion missing in https://github.com/theforeman/foreman/pull/9079#discussion_r796700058. I was saying we could switch to the rails behaviour, because I doubt we are relying on the weird behaviour of Cast::to_bool, but they are behaving differently so we need to think about it case by case IMHO.

But thanks a bunch for doing this! :orange_heart:

[stejskalleos]

@Dyrkon one more thing, we should also check plugins if they use Foreman::Cast.to_bool, and replace it it there too