[TEST][Robot] Refactor Robot test case to improve test step clarity and maintainability

[c3y1huang]

What's the test to develop? Please describe

Currently, some keywords contain embedded validation and extra operations, which can lead to complex and hard-to-maintain test cases. To improve clarity and maintainability, we should avoid combining multiple operations within a single keyword.

We need to review all Robot keywords and test cases to ensure that validations and operations are visible at the test case level and that each test step performs only a single operation.

A refactored example: longhorn/longhorn-tests@407bb20

Describe the tasks for the test

• Refactor test cases, keywords, and libraries to separate multiple operations into distinct steps.

Additional context

https://suse.slack.com/archives/C02HBK5AVC5/p1733103014124679

[c3y1huang]

cc @derekbit @khushboo-rancher

[derekbit]

Thanks to @c3y1huang for pointing out the issue.

Hello @yangchiu,
@c3y1huang and I think the refactoring is a high priority, as the code may become increasingly difficult to maintain and refactor over time. Let's address it first. Thank you.

cc @longhorn/qa @khushboo-rancher @innobead

[yangchiu]

• https://github.com/longhorn/longhorn-tests/blob/9d87310e31abf160ce98dacc86817f44e8e0ead6/e2e/libs/volume/crd.py#L69-L72

[yangchiu]

@derekbit @c3y1huang Feel free to list where you think should be refined to make this ticket more clear. Thank you!