{Core} AdalAuthentication doesn't honor `scopes` for Track 2 SDK

[jiasli]

Describe the bug

In Track 2 SDK, scopes (resource) is managed by SDK, instead of Azure CLI. For example, in AzureAppConfigurationClient:

if aad_mode:
    scope = base_url.strip("/") + "/.default"

But in get_token, scopes is not honored (discarded), resulting in getting a token for a wrong scopes (ARM https://management.core.windows.net/ by default):

azure-cli/src/azure-cli-core/azure/cli/core/adal_authentication.py

Lines 61 to 67 in c2b9a2c

	# This method is exposed for Azure Core.
	def get_token(self, *scopes, **kwargs): # pylint:disable=unused-argument
	_, token, full_token, _ = self._get_token()
	try:
	return AccessToken(token, int(full_token['expiresIn'] + time.time()))
	except KeyError: # needed to deal with differing unserialized MSI token payload
	return AccessToken(token, int(full_token['expires_on']))

[yonzhan]

Core