Update unit tests

### Feature description

Currently, `tm.hermes` uses snapshot tests (e.g., `.png`, `.md`) to verify the accuracy of the module, including content produced by `hermes`, the engine package behind it.

However, validating the content generated by `hermes` should not be part of `tm.hermes` unit tests. That validation belongs within the engine package itself.

Let’s follow this same principle when writing unit tests for `tm.hermes` and apply it consistently across our other modules.

### Acceptance Criteria
* Remove unit tests that is out of scope from tm.hermes (i.e. calculation result related tests)
* Unit tests should only focus on tm.hermes elements, consistent with what we've done on other teal modules packages.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct.

### Contribution Guidelines

- [x] I agree to follow this project's Contribution Guidelines.

### Security Policy

- [x] I agree to follow this project's Security Policy.