Refactor test suite

[keikumata]

Currently we have multiple auth types to use ServiceBus (connection string, MSI clientID, MSI resourceID), and we have to duplicate the tests we write based on each auth type, like below:

--- PASS: TestPubSub (207.63s)
--- PASS: TestPubSub/TestCreateNewListenerWithConnectionString (0.00s)
--- PASS: TestPubSub/TestCreateNewListenerWithManagedIdentity (0.07s)
--- PASS: TestPubSub/TestCreatePublisherWithConnectionStringUsingExistingTopic (0.18s)
--- PASS: TestPubSub/TestCreatePublisherWithConnectionStringUsingNewTopic (2.34s)
--- PASS: TestPubSub/TestCreatePublisherWithManagedIdentityResourceIDUsingNewTopic (2.66s)
--- PASS: TestPubSub/TestCreatePublisherWithManagedIdentityUsingExistingTopic (0.40s)
--- PASS: TestPubSub/TestCreatePublisherWithManagedIdentityUsingNewTopic (2.49s)
--- PASS: TestPubSub/TestListenWithCustomFilter (20.01s)
--- PASS: TestPubSub/TestListenWithCustomFilterUsingManagedIdentity (20.02s)
--- PASS: TestPubSub/TestListenWithCustomSubscription (10.00s)
--- PASS: TestPubSub/TestListenWithDefault (10.00s)
--- PASS: TestPubSub/TestListenWithDefaultUsingManagedIdentity (10.00s)
--- PASS: TestPubSub/TestListenWithDefaultUsingManagedIdentityResourceID (10.00s)
--- PASS: TestPubSub/TestPublishAndListenWithConnectionStringUsingCustomHeaderFilter (20.24s)
--- PASS: TestPubSub/TestPublishAndListenWithConnectionStringUsingDefault (5.11s)
--- PASS: TestPubSub/TestPublishAndListenWithConnectionStringUsingDuplicateDetection (11.91s)
--- PASS: TestPubSub/TestPublishAndListenWithConnectionStringUsingTypeFilter (20.20s)
--- PASS: TestPubSub/TestPublishAndListenWithManagedIdentityUsingCustomHeaderFilter (20.13s)
--- PASS: TestPubSub/TestPublishAndListenWithManagedIdentityUsingDefault (5.19s)
--- PASS: TestPubSub/TestPublishAndListenWithManagedIdentityUsingDuplicateDetection (12.04s)
--- PASS: TestPubSub/TestPublishAndListenWithManagedIdentityUsingTypeFilter (20.29s)
PASS

We would really like to just pass in a token provider or an auth type into the test suite so we don't have to duplicate the tests every time we add a new feature.