{Misc.} Change deprecated assertRaisesRegexp to assertRaisesRegex

[jiasli]

Description

According to https://docs.python.org/3/library/unittest.html#deprecated-aliases, assertRaisesRegexp has been replaced with assertRaisesRegex.

pytest now files DeprecationWarning in Python 3.10 for assertRaisesRegexp (#20195):

> pytest src/azure-cli-core/azure/cli/core/tests/test_profile.py

azure/cli/core/tests/test_profile.py::TestProfile::test_get_auth_info_for_logged_in_service_principal
  D:\cli\py310\lib\site-packages\win32\lib\pywintypes.py:51: DeprecationWarning: getargs: The 'u' format is deprecated. Use 'U' instead.
    found = _win32sysloader.GetModuleFilename(filename)

azure/cli/core/tests/test_profile.py::TestProfile::test_get_login_credentials_aux_tenants
  D:\cli\azure-cli\src\azure-cli-core\azure\cli\core\tests\test_profile.py:935: DeprecationWarning: Please use assertRaisesRegex instead.
    with self.assertRaisesRegexp(CLIError,

azure/cli/core/tests/test_profile.py::TestProfile::test_get_raw_token_in_cloud_console
  D:\cli\azure-cli\src\azure-cli-core\azure\cli\core\tests\test_profile.py:1171: DeprecationWarning: Please use assertRaisesRegex instead.
    with self.assertRaisesRegexp(CLIError, 'Cloud Shell'):

azure/cli/core/tests/test_profile.py::TestProfile::test_get_raw_token_msi_system_assigned
  D:\cli\azure-cli\src\azure-cli-core\azure\cli\core\tests\test_profile.py:1138: DeprecationWarning: Please use assertRaisesRegex instead.
    with self.assertRaisesRegexp(CLIError, "MSI"):

[yonzhan]

Misc