Restore pytest-asyncio to base test requirements (#355)

* Initial plan

* Add pytest-asyncio back to tests/requirements.txt

Co-authored-by: shaypal5 <917954+shaypal5@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: shaypal5 <917954+shaypal5@users.noreply.github.com>

Author: Copilot

tests/requirements.txt

@@ -1,6 +1,7 @@
 # todo: add some version range or pinning latest versions
 # tests and coverages
 pytest
+pytest-asyncio
 pytest-xdist  # for parallel test execution
 pytest-rerunfailures  # for retrying flaky tests
 coverage