refactor(firestore): [PQ] remove index mode

[bhshkh]

Index mode has been postponed to GA. removing it.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the Firestore client library by removing the WithIndexMode functionality. This change is necessary because the index mode feature, which was previously introduced, has been deferred for release until General Availability, making its current inclusion premature.

Highlights

• Removal of Index Mode: The WithIndexMode function and its associated documentation comment have been removed from firestore/pipeline.go. This change reflects the decision to postpone the index mode feature until General Availability (GA).

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[gemini-code-assist]

Code Review

This pull request removes the WithIndexMode function as the feature has been postponed. The change is straightforward. I've left one comment suggesting the removal of potentially related dead code, specifically the IndexMode field in executeSettings and its usages, to maintain code quality.

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firestore/pipeline.go (101-106)

With the removal of WithIndexMode, the IndexMode field on the executeSettings struct and any logic that uses it might now be dead code. To keep the codebase clean, please consider removing these as well if they are no longer used.