Refactor HybridQueryBuilderTests to decouple types from K-NN library

[owaiskazi19]

Is your feature request related to a problem?

Coming from #859. Refactored HybridQueryTests and HybridQueryPhaseSearcherTests in #977. Similarly, need to decouple knn for HybridQueryBuilderTests.

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[yuye-aws]

The PR #977 has been merged. What else do we need to do?

[owaiskazi19]

The PR #977 has been merged. What else do we need to do?

PR was for other 2 different test classes.

[martin-gaievski]

Scope for this issue is removal of compile time dependency from
HybridQueryTests and HybridQueryBuilderTests