synapse-admin: remove deprecated vars, introduce matrix_synapse_admin_configuration_extension_json_auto

roles/custom/matrix-synapse-admin/defaults/main.yml

@@ -149,7 +149,6 @@ matrix_synapse_admin_path_prefix: /synapse-admin
 matrix_synapse_admin_configuration_default:
   restrictBaseUrl: "{{ matrix_synapse_admin_config_restrictBaseUrl }}"
   asManagedUsers: "{{ matrix_synapse_admin_config_asManagedUsers }}"
-  supportURL: "{{ matrix_synapse_admin_config_supportURL }}"
   menu: "{{ matrix_synapse_admin_config_menu }}"
 
 # Your custom JSON configuration for synapse-admin should go to `matrix_synapse_admin_configuration_extension_json`.
@@ -169,7 +168,10 @@ matrix_synapse_admin_configuration_default:
 #  }
 matrix_synapse_admin_configuration_extension_json: '{}'
 
-matrix_synapse_admin_configuration_extension: "{{ matrix_synapse_admin_configuration_extension_json | from_json if matrix_synapse_admin_configuration_extension_json | from_json is mapping else {} }}"
+# This is similar to `matrix_synapse_admin_configuration_extension_json`, but intended for use by playbook or group vars
+matrix_synapse_admin_configuration_extension_json_auto: {}
+
+matrix_synapse_admin_configuration_extension: "{{ matrix_synapse_admin_configuration_extension_json_auto | combine(matrix_synapse_admin_configuration_extension_json | from_json if matrix_synapse_admin_configuration_extension_json | from_json is mapping else {}, recursive=True) }}"
 
 # Holds the final synapse-admin configuration (a combination of the default and its extension).
 # You most likely don't need to touch this variable. Instead, see `matrix_synapse_admin_configuration_default`.
@@ -194,10 +196,6 @@ matrix_synapse_admin_config_restrictBaseUrl: "{{ [matrix_homeserver_url] }}"  #
 # ]
 matrix_synapse_admin_config_menu: []
 
-# Controls the supportURL configuration setting, which, if defined, replaces the default link to the Synapse Admin GitHub repository.
-# DEPRECATED: use matrix_synapse_admin_config_menu instead (migrated automatically).
-matrix_synapse_admin_config_supportURL: ''  # noqa var-naming
-
 # Controls the asManagedUsers configuration setting (managed by playbook), which, if defined,
 # restricts modifications of the specified users (e.g., bridge-managed).
 # You should use JS regex syntax to match the user IDs.