CI: Fix circular import error for Airflow 2.2.5

[kaxil]

This should fix the following in CI:

File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/src/astro/custom_backend/astro_custom_backend.py", line 6, in <module>
    from astro.custom_backend.serializer import deserialize, serialize
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/src/astro/custom_backend/serializer.py", line 17, in <module>
    from astro.files import File
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/src/astro/files/__init__.py", line 6, in <module>
    from astro.files.operators.files import get_file_list_func  # noqa: F401 # skipcq: PY-W2000
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/src/astro/files/operators/files.py", line 5, in <module>
    from airflow.decorators.base import get_unique_task_id
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/.nox/test-3-8-airflow-2-2-5/lib/python3.8/site-packages/airflow/decorators/__init__.py", line 20, in <module>
    from airflow.decorators.python import PythonDecoratorMixin, python_task  # noqa
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/.nox/test-3-8-airflow-2-2-5/lib/python3.8/site-packages/airflow/decorators/python.py", line 20, in <module>
    from airflow.decorators.base import DecoratedOperator, task_decorator_factory
  File "/home/runner/work/astro-sdk/astro-sdk/python-sdk/.nox/test-3-8-airflow-2-2-5/lib/python3.8/site-packages/airflow/decorators/base.py", line 26, in <module>
    from airflow.models import BaseOperator
ImportError: cannot import name 'BaseOperator' from partially initialized module 'airflow.models' (most likely due to a circular import)

[pankajkoti]

With this it means we are exposing now get_file_list_func as
from astro.files.operators.files import get_file_list_func, instead of the previous
from astro.files import get_file_list_func from
PR #1380 and that should not be an issue, right?

[kaxil]

With this it means we are exposing now get_file_list_func as from astro.files.operators.files import get_file_list_func, instead of the previous from astro.files import get_file_list_func from PR #1380 and that should not be an issue, right?

yup

[codecov]

Codecov Report

Base: 93.95% // Head: 93.13% // Decreases project coverage by -0.81% ⚠️

Coverage data is based on head (a6a2013) compared to base (f9db91a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1396      +/-   ##
==========================================
- Coverage   93.95%   93.13%   -0.82%     
==========================================
  Files          73       54      -19     
  Lines        3538     2854     -684     
  Branches      337      337              
==========================================
- Hits         3324     2658     -666     
+ Misses        148      130      -18     
  Partials       66       66              

Impacted Files	Coverage Δ
python-sdk/src/astro/files/__init__.py	81.81% <ø> (-1.52%)	⬇️
sql-cli/sql_cli/__init__.py
sql-cli/sql_cli/astro/utils.py
sql-cli/sql_cli/templates/render_dag.py.jinja2
sql-cli/sql_cli/operators/load_file.py
sql-cli/sql_cli/workflow_directory_parser.py
sql-cli/sql_cli/run_dag.py
sql-cli/sql_cli/utils/airflow.py
sql-cli/sql_cli/connections.py
sql-cli/sql_cli/astro/group.py
... and 10 more

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