fix unittests to work with aiohttp 3.10+

[tomplus]

This PR adjusts unitests to work with aiohttp 3.10+ where http sessions have to be created within an async function.
Ref: aio-libs/aiohttp#8555

[codecov]

Codecov Report

Attention: Patch coverage is 3.93701% with 122 lines in your changes missing coverage. Please review.

Project coverage is 28.11%. Comparing base (f53d443) to head (154c772).

Files	Patch %	Lines
...tes_asyncio/test/test_admissionregistration_api.py	0.00%	2 Missing ⚠️
..._asyncio/test/test_admissionregistration_v1_api.py	0.00%	2 Missing ⚠️
...io/test/test_admissionregistration_v1alpha1_api.py	0.00%	2 Missing ⚠️
...cio/test/test_admissionregistration_v1beta1_api.py	0.00%	2 Missing ⚠️
kubernetes_asyncio/test/test_apiextensions_api.py	0.00%	2 Missing ⚠️
...bernetes_asyncio/test/test_apiextensions_v1_api.py	0.00%	2 Missing ⚠️
...ubernetes_asyncio/test/test_apiregistration_api.py	0.00%	2 Missing ⚠️
...rnetes_asyncio/test/test_apiregistration_v1_api.py	0.00%	2 Missing ⚠️
kubernetes_asyncio/test/test_apis_api.py	0.00%	2 Missing ⚠️
kubernetes_asyncio/test/test_apps_api.py	0.00%	2 Missing ⚠️
... and 51 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #326   +/-   ##
=======================================
  Coverage   28.11%   28.11%           
=======================================
  Files         779      779           
  Lines       92138    92138           
=======================================
  Hits        25904    25904           
  Misses      66234    66234           

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