Remove Circular Usage of RecordedData in Form Recognizer Tests

[alzimmermsft]

Currently, some Form Recognizer tests depended on a deficiency in azure-core-test where network calls would be recorded when in PLAYBACK (PR fixing the deficiency). Resolving the deficiency resulted in Form Recognizer tests breaking as they attempt to read network calls that were read and remove but then added back due to recording of a recorded network call, now this network call is no longer being re-recorded.

• https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/formrecognizer/azure-ai-formrecognizer/src/test/java/com/azure/ai/formrecognizer/FormRecognizerClientTestBase.java#L1047
• https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/formrecognizer/azure-ai-formrecognizer/src/test/java/com/azure/ai/formrecognizer/FormRecognizerClientTestBase.java#L1059
• https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/formrecognizer/azure-ai-formrecognizer/src/test/java/com/azure/ai/formrecognizer/FormTrainingClientTestBase.java#L241

Additionally, these tests are adding network calls to the recording from outside of the testing framework which generally shouldn't occur.