test: Remove live feed unit tests

[DaveSkender]

Description

As a better practice, we're replacing the one live data feed unit test with a static one and removing the live feed test rig. We'll be adding a separate integration test setup later.

Checklist

• My code follows the existing style, code structure, and naming taxonomy
• I have put comments in my code, particularly for hard-to-understand areas
• I have performed a self-review of my code and included any verifying manual calculations
• I have added or updated unit tests that prove my fix is effective or that my feature works and achieves sufficient code coverage. New and existing unit tests pass locally and in the build (below) with my changes
• My changes generate no new warnings or other code analysis issues
• I have added or run the performance tests that depict optimal execution times
• I have made corresponding changes to the documentation

Related

• test: Isolate integration, external tests #1156

[github-actions]

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