Prevent historical state from being pushed to an application service via...

Prevent historical state from being pushed to an application service via `/transactions` (MSC2716) (#11265)

Mark historical state from the MSC2716 `/batch_send` endpoint as `historical` which makes it `backfilled` and have a negative `stream_ordering` so it doesn't get queried by `/transactions`.

Fix https://github.com/matrix-org/synapse/issues/11241

Complement tests: https://github.com/matrix-org/complement/pull/221