Update Search Relevance Workbench Tests

[wrigleyDan]

Description

During the development of opensearch-project/dashboards-search-relevance#804 the integration tests failed due to previous changes in dashboards-search-relevance. This PR updates the tests according to these changes and fixes linting errors:

• Route rename: singleQueryComparison → queryAnalysis

The plugin renamed its "Single Query Comparison" template to "Query Analysis", changing the route from singleQueryComparison to queryAnalysis.

• Removed cy.waitForLoader() calls

waitForLoader() checks for [data-test-subj="homeIcon"], which only exists in the legacy OSD header. When home:useNewHomePage = true is set in the OSD environment, the legacy header is not rendered and homeIcon never appears, causing a 60-second timeout.

Issues Resolved

n/a

Check List

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[wrigleyDan]

I'm seeing there is some redundancy in #1940
I'll convert this to draft until that one is merged to see what's left that needs addressing.