CI: Add local exceptions to flatpak-builder-lint

For some reason the action can no longer check if the URL generated in
the metainfo is reachable.
So to avoid keeping CI failing, local exceptions rule are
added.

Unfortunately it requires to keep a copy of exceptions already submitted
to Flathub.
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f