[CLI command only] Importing `Variable` from `airflow.sdk` causes an `ImportError: cannot import name 'SUPERVISOR_COMMS'` for top-level Variable when running `airflow dags reserialize`

EDIT: this only affects the CLI command `airflow dags reserialize`, the dag-processor handles the dag fine and it runs correctly. ### Apache Airflow version 3.0.0 ### If "Other Airflow 2 version" selected, which one? main ### What happened? This dag serializes and runs fine for `from airflow.models import Variable` but not for `from airflow.sdk import Variable` ``` from airflow.sdk import dag, Variable from airflow.decorators import task # from airflow.models import Variable # This one only works for imports from airflow.models, not from airflow.sdk var1 = Variable.get("v1", "TOP_LEVEL_VAR") @dag() def test_var(): @task def get_var(): print("TOP LEVEL VAR ", var1) # this one works for both imports, from airflow.sdk and from airflow.models var2 = Variable.get("v2", "TASK_LEVEL_VAR") print("TASK LEVEL VAR ", var2) get_var() test_var() ``` The error is only caused when the Variable is used at the top level of the dag, not when within a task. Error: ``` Traceback (most recent call last): File "/opt/airflow/task-sdk/src/airflow/sdk/definitions/variable.py", line 53, in get return _get_variable(key, deserialize_json=deserialize_json) File "/opt/airflow/task-sdk/src/airflow/sdk/execution_time/context.py", line 185, in _get_variable from airflow.sdk.execution_time.task_runner import SUPERVISOR_COMMS ImportError: cannot import name 'SUPERVISOR_COMMS' from 'airflow.sdk.execution_time.task_runner' (/opt/airflow/task-sdk/src/airflow/sdk/execution_time/task_runner.py) ``` ### What you think should happen instead? The dag should serialize and run with the updated import. ### How to reproduce Add the above dag to your env, run airflow dags reserialize, see the error. Switch the import of Variable to `airflow.models` to see the dag work. ### Operating System MacOS ### Versions of Apache Airflow Providers None ### Deployment Other ### Deployment details breeze ### Anything else? _No response_ ### Are you willing to sub…