Hopefully fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2849

Related to:
- https://github.com/matrix-org/synapse/issues/16101
- https://github.com/matrix-org/synapse/issues/16208

`spam_checker` has been deprecated for quite a while.
While it still probably works and while newer versions of
mjolnir-antispam still use it, we should switch to the new API.

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Now that Element v1.11.32 is out and https://github.com/vector-im/element-web/issues/19605 is fixed
(by https://github.com/matrix-org/matrix-react-sdk/pull/10975), we don't
need to force-disable this login type.

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2698
- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2700

This is meant to keep the configuration tidy for non-worker setups.

Related to 49cb8b7b11

Related to https://github.com/matrix-org/synapse/pull/15491

This doesn't hurt to be done early on, while still on Synapse v1.83.0.

We'll be able to remove the `worker_replication_*` settings later,
when Synapse v1.84.0 gets released and starts making use of the new
`main` instance in the instance map instead of looking at the
`worker_replication_*` settings.

* Add ability to disable password auth

* Allow disabling password authentication

Related to:

- https://github.com/matrix-org/synapse/pull/15281
- https://github.com/matrix-org/synapse/pull/15282

Larger deployments may wish to run migration more often.