tapioca dsl rejects valid values from --exclude if they are not loaded

[aalong-tr]

I use some automation scripts to simplify managing Sorbet across modules in a monorepo.
One of these scripts uses the command tapioca dsl --exclude ActiveRecordFixtures UrlHelpers

As of 0.12.0, this command still works fine for the modules that load Rails in its entirety; but on a few simpler gems, the command now fails with:

Error: Cannot find compiler 'ActiveRecordFixtures'
Error: Cannot find compiler 'UrlHelpers'

Since tapioca dsl --list-compilers does not list these entries when run against the impacted gems, modifying my script to check for the available compilers was easy enough; but it would be nice if the --exclude flag would accept allowable compilers even when they are not loaded.

[KaanOzkan]

I think making them warnings instead is a good solution.

[aalong-tr]

Thank you for this!