test(reactive): Fix support of runtime tests in feeds testing library

[dr1rrb]

GitHub Issue (If applicable): #

PR Type

• Bugfix: Fix support of runtime tests in feeds testing library
• Refactoring: move UI related tests to runtime tests

What is the current behavior?

The base class FeedTests relies on the TestContext that is not yet supported by runtime tests engine

What is the new behavior?

FeedTests allow null-ref for the TestContext

PR Checklist

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

[dr1rrb]

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