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.

Signed-off-by: Joe Kappus <joe@wt.gd>

It's unnecessary when `pusher_instances` is populated.

Source: 6acb6d772a

It's unnecessary when `federation_sender_instances` is populated.

Source: 6acb6d772a

Synapse Worker configuration updates are coming later.

This path is accessed by the s3 storage provider stuff and needs to be
ensured.

Broken by 7c5c3aedc

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.