feat(firestore): [NOT READY FOR REVIEW] add pipeline queries (#12217)

[bhshkh]

• feat(firestore): add pipeline queries

• add comments

• remove exists

[bhshkh]

/gemini help

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[bhshkh]

/gemini review

[github-actions[bot]]

⚠️ Breaking change detected in pre-GA module: firestore

The apidiff check has detected one or more breaking changes in this module for pre-GA APIs.

Pre-GA breaking changes do not block the pull request, but are flagged here for review.

For any pre-GA breaking change that needs investigation, open a new issue containing a link to this comment, then you may proceed with reviewing and merging this PR.

- ./apiv1/firestorepb.FirestoreClient.ExecutePipeline: added
- ./apiv1/firestorepb.FirestoreServer.ExecutePipeline: added