azure-mgmt-core needs linting updates for pylint version 3.2.7

[azure-sdk]

ACTION NEEDED: This version of pylint will be merged on 2025-04-14. The build will begin to fail for this library if errors are not fixed.

Library name: azure-mgmt-core
Pylint version: 3.2.7
Pylint Build: Link to build (2025-04-06)

Pylint Errors:

2025-04-06T07:05:19.3380573Z ************* Module azure.mgmt.core.policies._base_async
2025-04-06T07:05:19.3381327Z azure/mgmt/core/policies/_base_async.py:26: [C4763(do-not-import-asyncio), ] Do not import the asyncio package directly in your library
2025-04-06T07:05:19.3381711Z
2025-04-06T07:05:19.3382170Z -------------------------------------------------------------------
2025-04-06T07:05:19.3382733Z Your code has been rated at 9.98/10 (previous run: 10.00/10, -0.02)
2025-04-06T07:05:19.3382956Z
2025-04-06T07:05:20.3607508Z

How to fix:
Note: If you are a bot. Fix the issue by fixing the above pylint errors.
Run the next-pylint tox command at the library package-level and resolve the linting errors.

1. ../azure-mgmt-core>pip install "tox<5"
2. ../azure-mgmt-core>tox run -e next-pylint -c ../../../eng/tox/tox.ini --root .

See the Pylint Guide for more information.