Extend the release script to wait for GitHub Actions to finish and to be usable as a guide for the whole process. (#13483)

Add a `merge-back` command to the release script, which automates merging the correct branches after a release. (#13393)

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

Extend the release script to automatically push a new SyTest branch, rather than having that be a manual process. (#12978)

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

Add the ability to set the log level using the `SYNAPSE_TEST_LOG_LEVEL` environment when using `complement.sh`. (#13152)

Add a `-f` argument to `complement.sh` to skip the docker build

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

* Bump the HS startup timeout
* Log prefixes for more processes
* Bump the overall timeout

Check we're on the right branch before tagging, and on the right tag before uploading

* Abort if we're on the wrong branch
* Check we have the right tag checked out
* Clarify that `publish` only releases to GitHub

Not enforced in config yet. One day.

Poetry now manages the project version in pyproject.toml.

When we join a room via the faster-joins mechanism, we end up with "partial
state" at some points on the event DAG. Many parts of the codebase need to
wait for the full state to load. So, we implement a mechanism to keep track of
which events have partial state, and wait for them to be fully-populated.

* Remove leftover references to setup.py

Missed in #12478.

* Changelog

The release script used to incorrectly write `New synapse release 1.57.0~rc1.`
instead of `New synapse release 1.57.0rc1.`

Co-authored-by: Jan Christian Grünhage <jan.christian@gruenhage.xyz>
Co-authored-by: Marcus Hoffmann <bubu@bubu1.eu>

This wasn't quite generating the right thing.

Fixes matrix-org/complement#330 (or it will, once we remove the old files).

It's not quite a lift-and-shift: I've also taken the opportunity to get rid of the custom CA that we used to use to sign the TLS certs, which has been superceded by the CA exposed by Complement.