CV2-5589 resolve broken requests to delete messages

[DGaffney]

Description

More knock-ons of bad test mocks and switchover from multi stateful to single stateless

Reference: CV2-5589

How has this been tested?

Worked through the current issue on sentry locally and confirmed this will return a queue properly

Are there any external dependencies?

None

Have you considered secure coding practices when writing this code?

None

[sonoransun]

✔️

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AttributeError: 'str' object has no attribute 'delete_messages' lib.queue.queue in delete_messages_from_queue View Issue

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