Allow rules to specify specific repositories to ignore or run in

[kdenhartog]

This is useful in the case where we want to make specific modifications to rules for only a select number of repositories. One example of this is that we want to allow expect usage, but still alert on unwrap in Search specific repositories. However, within Brave-core we want to make sure we alert on both. This should allow us to fork rules to make them specific to the repository they run on.

[kdenhartog]

Ideally we don't want to go this route of per-repo specific rules. I'll instead take an approach in line with the blocklists we're already using instead.