Filter projects from review board via exclude list

[dgershman]

Summary

Add a configurable exclude list to hide specific projects from appearing on the review board.

Details

• Setting should accept a comma-separated list of repositories (e.g. zarf-dev/zarf,bmlt-enabled/yap)
• Projects matching the exclude list should be filtered out from the board entirely
• Could be stored in the app config/settings

Example

zarf-dev/zarf,bmlt-enabled/yap

Any review items from these repos would not show up on the board.