Remove variables controlling removed Element options (`secure_backup_required` & `secure_backup_setup_methods`) from `/.well-known/matrix/client`

Ref:

- https://github.com/element-hq/element-web/pull/30681
- https://github.com/element-hq/element-web/pull/30702

roles/custom/matrix-base/tasks/validate_config.yml

@@ -31,6 +31,8 @@
     - {'old': 'matrix_client_element_e2ee_default', 'new': 'matrix_static_files_file_matrix_client_property_io_element_e2ee_default'}
     - {'old': 'matrix_client_element_e2ee_secure_backup_required', 'new': 'matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required'}
     - {'old': 'matrix_client_element_e2ee_secure_backup_setup_methods', 'new': 'matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods'}
+    - {'old': 'matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required', 'new': '<removed; see https://github.com/element-hq/element-web/pull/30702 and https://github.com/element-hq/element-web/pull/30681>'}
+    - {'old': 'matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods', 'new': '<removed; see https://github.com/element-hq/element-web/pull/30702 and https://github.com/element-hq/element-web/pull/30681>'}
     - {'old': 'matrix_container_global_registry_prefix', 'new': '<no global variable anymore; you need to override the `_registry_prefix` variable in each component separately>'}
     - {'old': 'matrix_user_username', 'new': 'matrix_user_name'}
     - {'old': 'matrix_user_groupname', 'new': 'matrix_group_name'}

roles/custom/matrix-static-files/defaults/main.yml

@@ -172,10 +172,9 @@ matrix_static_files_file_matrix_client_property_m_tile_server_map_style_url: ""
 
 # Controls whether Element related entries (io.element.e2ee) should be added to the client well-known.
 # By default if any of the following change from their default this would be set to true:
-# `matrix_static_files_file_matrix_client_property_io_element_e2ee_default`
-# `matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required`
-# `matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods`
-matrix_static_files_file_matrix_client_property_io_element_e2ee_entries_enabled: "{{ not matrix_static_files_file_matrix_client_property_io_element_e2ee_default or matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required or matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods | length > 0 }}"
+# - `matrix_static_files_file_matrix_client_property_io_element_e2ee_default`
+# - `matrix_static_files_file_matrix_client_property_io_element_e2ee_force_disable`
+matrix_static_files_file_matrix_client_property_io_element_e2ee_entries_enabled: "{{ not matrix_static_files_file_matrix_client_property_io_element_e2ee_default or matrix_static_files_file_matrix_client_property_io_element_e2ee_force_disable }}"
 
 # Controls the io.element.e2ee/default property in the /.well-known/matrix/client file,
 # which instructs Element clients whether they should use End-to-End Encryption by default.
@@ -183,19 +182,6 @@ matrix_static_files_file_matrix_client_property_io_element_e2ee_entries_enabled:
 # See: https://github.com/element-hq/element-web/blob/develop/docs/e2ee.md
 matrix_static_files_file_matrix_client_property_io_element_e2ee_default: true
 
-# Controls the io.element.e2ee/secure_backup_required property in the /.well-known/matrix/client file,
-# which instructs Element clients whether they should require a secure backup set up before they can be used.
-# Setting this to true will update `/.well-known/matrix/client` and tell Element clients require a secure backup.
-# See: https://github.com/element-hq/element-web/blob/develop/docs/e2ee.md
-matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required: false
-
-# Controls the io.element.e2ee/secure_backup_setup_methods property in the /.well-known/matrix/client file,
-# which instructs Element clients which backup methods from ["key", "passphrase"] should be used.
-# When an empty list is provided, Element clients default to using both.
-# Setting this to other than empty will update `/.well-known/matrix/client` and tell Element clients which method to use.
-# See: https://github.com/element-hq/element-web/blob/develop/docs/e2ee.md
-matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods: []
-
 # Controls the io.element.e2ee/force_disable property in the /.well-known/matrix/client file,
 # which can be set to `true` to instruct Element clients whether to disable End-to-End Encryption by default
 # and to not show encryption related-settings in room settings.

roles/custom/matrix-static-files/templates/public/.well-known/matrix/client.j2

@@ -44,8 +44,6 @@
 	{% if matrix_static_files_file_matrix_client_property_io_element_e2ee_entries_enabled %},
 	"io.element.e2ee": {
 		"default": {{ matrix_static_files_file_matrix_client_property_io_element_e2ee_default|to_json }},
-		"secure_backup_required": {{ matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_required|to_json }},
-		"secure_backup_setup_methods": {{ matrix_static_files_file_matrix_client_property_io_element_e2ee_secure_backup_setup_methods|to_json }},
 		"force_disable": {{ matrix_static_files_file_matrix_client_property_io_element_e2ee_force_disable|to_json }}
 	}
 	{% endif %}