Remove some more joins on room_memberships

Fix current_state bg update to work on old SQLite

* Fix debian packages for sid being called buster.

I don't know why the sid images return buster as its codename in
`lsb_release` but it does, so lets just grab the codename from the
distro we pass into dockerfile

* Newsfile

Add ability to pass arguments to looping calls

Log when we receive a /make_* request from a different origin

Make sure that synapse doesn't explode when a redaction redacts itself, or
there is a larger cycle.

log when a redaction attempts to redact an event in a different room

There was some inconsistent behaviour in the caching layer around how
exceptions were handled - particularly synchronously-thrown ones.

This seems to be most easily handled by pushing the creation of
ObservableDeferreds down from CacheDescriptor to the Cache.

Bugfixes
--------

- Fix a regression introduced in v1.2.0rc1 which led to incorrect labels on some prometheus metrics. ([\#5734](https://github.com/matrix-org/synapse/issues/5734))

Log when we receive receipt from a different origin

`None` is not a valid event id, so queuing up a database fetch for it seems
like a silly thing to do.

I considered making `get_event` return `None` if `event_id is None`, but then
its interaction with `allow_none` seemed uninituitive, and strong typing ftw.

* Fix servlet metric names

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

* Remove redundant check

* Cover all return paths

This will allow us to efficiently filter out rooms that have been
forgotten in other queries without having to join against the
`room_memberships` table.