Keep Synapse worker definitions in vars.yml to avoid an extra file include on each playbook task

Improves:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2232
- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2217#issuecomment-1304366791

With this change, trying to run the playbook should report an error that
looks like this:

> The offending line appears to be:
>
>     # Most of the roles below are not distributed with the playbook, but downloaded separately using `ansible-galaxy` via the `make roles` command (see `Makefile`).
>     - role: galaxy/com.devture.ansible.role.playbook_help
>       ^ here

.. with that comment included, which might help some people who missed
the `make roles` part.

Improves https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2232

dendrite: update image tag to latest release (0.10.7)

- https://github.com/matrix-org/dendrite/releases/tag/v0.10.7

Related to 410a915a8a

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.

fix(mautrix-discord): allow configuring the restricted_rooms option

Fixed filter for Synapse stream_writer HS config

Pin mautrix-instagram to v0.2.2

Save the GIT hash when running the playbook to allow for easy recovery

Update element 1.11.12 -> 1.11.13

dendrite: update tag to v0.10.6

- update tag to latest dendrite release (https://github.com/matrix-org/dendrite/releases/tag/v0.10.6)

Continuation of c3dc64b1d5

We no longer ask users to create Matrix user accounts for these bots:

- Postmoogle
- Honoroit
- Reminder Bot

Other bots and services (matrix-registration-bot, maubot, mjolnir,
Dimension, etc.) require an Access Token to run (not a password),
so this new role doesn't help for them.

It does help for the above bots though, and for defining your own
"initial user accounts" in the `matrix_user_creator_users_additional`
variable.

Dendrite uses a lot of databases, but a single (`dendrite`) role, which
leads to `matrix_postgres_import_roles_to_ignore` being something like
`['dendrite', 'dendrite', 'dendrite', ...]` needlessly.

This leads to weird regexes being generated for
`matrix_postgres_import_roles_ignore_regex`.
It's not that it hurts, but it just looks odd.

We were only reporting failures for when the async task didn't finish.
We also need to report a failure for when the task finished, but
returned a non-zero exit code.

This reverts commit 45c9c2b17a.