Clear environment variables before DefaultAzureCredential test #19106
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DefaultAzureCredential uses $AZURE_TENANT_ID as a default tenant for VisualStudioCodeCredential. #18846 was able to merge with a test that fails when that variable has a value because it doesn't have a value in CI. It has a value in the nightly live test run, however, so this PR unsets the variable at the start of the test. It also unsets AZURE_AUTHORITY_HOST to prevent a similar future problem when we start running live tests in sovereign clouds.