Move roles/matrix* to roles/custom/matrix*

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.

roles/custom/matrix-synapse/tasks/ext/s3-storage-provider/setup_uninstall.yml

@@ -0,0 +1,24 @@
+---
+
+- name: Ensure matrix-synapse-s3-storage-provider-migrate.service and timer don't exist
+  ansible.builtin.file:
+    path: "{{ matrix_systemd_path }}/{{ item }}"
+    state: absent
+  with_items:
+    - matrix-synapse-s3-storage-provider-migrate.timer
+    - matrix-synapse-s3-storage-provider-migrate.service
+  register: matrix_synapse_s3_storage_provider_migrate_sevice_removal
+
+- name: Ensure systemd reloaded after matrix-synapse-s3-storage-provider-migrate.service removal
+  ansible.builtin.service:
+    daemon_reload: true
+  when: matrix_synapse_s3_storage_provider_migrate_sevice_removal.changed | bool
+
+- name: Ensure s3-storage-provider files don't exist
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: absent
+  with_items:
+    - "{{ matrix_local_bin_path }}/matrix-synapse-s3-storage-provider-shell"
+    - "{{ matrix_local_bin_path }}/matrix-synapse-s3-storage-provider-migrate"
+    - "{{ matrix_synapse_ext_s3_storage_provider_path }}"