fix(insights): retrieve index name from query if not returned by response

[dhayab]

This PR fixes an issue that occurs when the Insights plugin tries to determine whether a source item is coming from Algolia or not, to prepare an Insights event if necessary.

When an Algolia index is configured to restrict the fields returned from the API (with responseFields) and doesn't return the index property, our code falsely assumes that the item is not coming from Algolia, so it doesn't have an Insights payload generated.

Because we know at query time which index we are targeting, we can at response time resolve this issue by retrieving the index name from the list of queries as a fallback.

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