As part of making the repo tools work for a second repo again, we need to move things that were hard-coded into the repo tools into config files:

• _issueTagForPackage hard-codes label mappings
• The repository link hard-codes a check for https://github.com/flutter/packages/tree/main as a prefix
• The main README PR link also hard-codes that prefix
• license_check hard-codes exceptions (We may leave this as-is; since these should be rare, and hard to add, so making it require a tool-level update is probably fine even once we are multi-repo)

(I'll update the list as I find more things.)