Build Tests for TNS Submissions

[tabbott36]

The TNS Submissions require sensitive information such as API keys. This information is currently protected using Pydantic's SecretStr class, however, the secret strings are not JSON serializable. This is preventing tests from being run on the TNS submissions.

Attempt at a solution: the data can be serialized using Pydantic's .get_secret_value() , however, this potentially puts sensitive information at risk when running tests. The desired solution would use either (1) enable TNS sandbox submissions using a "dummy" API key or (2) use the user's API key stored in their environment variables.