Add tests to account for a null appointment date time in the claims response

[kjduensing]

Description

We need to add tests to the backend and frontend to cover the case(s) of a null appointment date time. Doing this may uncover a bug we also need to fix.

From the API team:

Good morning, we have resolved the null appointment date issue on our side. The appointmentDate field in the /claims endpoint can now potentially have a null value. I don't know if this would be a breaking change for you or not. Hopefully not

Risks

• [ ] Adding these tests may uncover a bug we also need to fix, which may impact at least velocity and at most delivery

Acceptance Criteria

• [ ] All BE tests pass
• [ ] All FE tests pass
• [ ] Test coverage > 80%
• [ ] Datadog metrics for how many have null appts.
• [ ]

Definition of Done

• [ ] All acceptance criteria are met
• [ ] Documentation is updated

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How to configure this issue

• [ ] Attached to an Epic

[ayush-chak]

Links to 89328