Arguments are not quoted when calling `pytest`

[jiasli]

This issue is discovered while investigating Azure/azure-cli#27016

In the below example, '%(levelname)s %(name)s %(thread)d %(threadName)s %(message)s' is not quoted when being passed to pytest:

> azdev test test_keyvault_certificate_soft_delete --debug --pytest-args --log-level=DEBUG --log-format '%(levelname)s %(name)s %(thread)d %(threadName)s %(message)s'

cli.azdev.operations.testtool.pytest_runner: Running: python -m pytest -x -v -p no:warnings --log-level=WARN --junit-xml C:\Users\xxx\.azdev\env_config\cli\py310\test_results.xml d:\cli\azure-cli\src\azure-cli\azure\cli\command_modules\keyvault\tests\latest\test_keyvault_commands.py::KeyVaultCertificateRestoreScenarioTest::test_keyvault_certificate_soft_delete -n auto --log-level=DEBUG --log-format %(levelname)s %(name)s %(thread)d %(threadName)s %(message)s

This is because arguments with spaces are not quoted when constructing the command string:

azure-cli-dev-tools/azdev/operations/testtool/pytest_runner.py

Line 38 in da19747

cmd = 'python -m pytest {}'.format(' '.join(arguments))

Even though shlex.quote can be used to quote arguments, the recommended approach for calling subprocess.call is "providing a sequence of arguments": https://docs.python.org/3/library/subprocess.html#frequently-used-arguments.

Also see: Azure/cli#105