Sync to rhel-8 applying diff minus gating.yaml and changelog and old cruft. Re-add some Provides: bundled(...)
The content of this branch was automatically imported from Fedora ELN with the following as its source: https://src.fedoraproject.org/rpms/thunderbird#bbe0d15c7e2f5b6f7cfb370a9e638793ae62ac44