Hybrid queries ignore field boosts [#3584820]

Problem/Motivation

In a regular non-semantic Search API OpenSearch, field boosts will be applied to increase the score based on matches in certain fields.

This module's hybrid searches however doesn't do this for the phrase search half of the hybrid query, meaning the boosts defined in the Search API fields UI are just ignored.

Proposed resolution

Assemble the query differently so boosts are applied.

Issue fork search_api_opensearch_semantic-3584820

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3584820-hybrid-queries-ignore changes, plain diff MR !11
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