[Feature request] Un-ignore certain configs

[leymannx]

Like it is in .gitignore files it would be nice to have a Not-operator to un-ignore certain configs inside config-ignore.yml that otherwise would get ignored while matching a certain wildcard pattern.

Let's say I exclude all block instances:

ignore
  - block.block.*

But then I want to explicitly include certain blocks maybe like so:

ignore
  - block.block.*
  - !block.block.certainblock

[LaravZ]

Such a feature would be very desirable for my project as well since we will end up with a long list in the config-ignore.yml file.