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Remove Salmon and PubSubHubbub #11205
This prevents the reception of messages through OStatus as well as renewal of OStatus subscriptions in both directions. The admin page for PubSubHubbub subscriptions has been removed as it would no longer serve any purpose.
Removing support for OStatus has been a goal since Mastodon's switch to ActivityPub in 2017. Maintaining two separate code paths for sending and receiving messages increases vectors for attacks and some parts of the OStatus draft protocol are inherently less secure than ActivityPub. At this point the fediverse is almost entirely based on ActivityPub, with GNU Social remaining the only OStatus-only platform.