Automatic test value updating after test net update

[LeonardTibben]

Every time the test net updates, all automated tests fail because the values of the responses have changed. To fix this the json response for a specific api call could be gotten and stored. that way the tests can use these values to compare their results to.

Values from the api could be gotten with a bash script and stored in a .env file or could be gotten within the test using http.

[ejorritsma]

Important to note that this is a necessary and helpful addition to our codebase, since the Testnet resets every quarter, plus in between if required by large updates.

https://developers.stellar.org/docs/fundamentals-and-concepts/networks