Add spent addresses test

[DyrellC]

Description

Add a regression test for spent addresses. This test ensures that a spent addresses are registered as spent from in three scenarios:

1. As an unconfirmed transaction
2. As a confirmed transaction
3. After the transaction has been pruned from the db

Finishes #1442

Type of change

• Enhancement (a non-breaking change which adds functionality)

How Has This Been Tested?

Tests run on local nodes and on a minkube setup.

Checklist:

• My code follows the style guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[GalRogozinski]

Waiting to merge #1505 before

[GalRogozinski]

apparently there are conflicts @DyrellC

[GalRogozinski]

Looks good :-)
I like how most of the change is in Gherkin, meaning the regression framework is indeed in a good place.

Just one change request and one question

[GalRogozinski]

Fails with BadApiResponse: 400 response from node: This operation cannot be executed: The subtangle has not been updated yet.

[GalRogozinski]

I see the test is passing...

I still had one request for a change in the test that wasn't yet completed. Besides that, all is well.

[DyrellC]

@galrogo Another buildkite failure that wasn't due to the tests. I've contacted Sadjy already regarding the service being down. Hopefully it's resolved by tomorrow and I can get this and 1584 passed via buildkite again as well