OTW many empty dirs are kept

These three roles have multiple variable prefixes each:
- kakaotalk: matrix_appservice_kakaotalk + matrix_appservice_kakaotalk_node
- telegram: matrix_mautrix_telegram + matrix_mautrix_telegram_lottieconverter
- synapse: matrix_synapse + matrix_synapse_customized + matrix_synapse_rust_synapse_compress_state

For each: renamed _docker_image* to _container_image* (and _docker_src*,
_docker_repo* where applicable), added deprecation entries in
validate_config.yml, updated group_vars references, and moved
deprecation tasks to the front of validate_config.yml.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4445

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Fix s3-storage migrate and shell: container needs attachment to postgres network also

* Connect to s3-storage-provider migrate to multiple networks in multiple steps

Multiple `--network` calls lead to:

> docker: Error response from daemon: Container cannot be connected to network endpoints: NETWORK_1 NETWORK_2.

* Connect to s3-storage-provider shell to multiple networks in multiple steps

---------

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

It's the same as `matrix_docker_network` for now, so this practically
doesn't change anything.