[2/5] remote codebase indexing telemetry

[moirahuang]

Description

Add telemetry for remote codebase indexing

Testing

• I have manually tested my changes locally with ./script/run

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@moirahuang

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[oz-for-oss]

Overview

This PR adds telemetry for remote codebase search outcomes and remote codebase index mutations, including coarse result metadata, durations/counts, embedding config, and remote platform info.

Concerns

• No blocking correctness or security concerns found in the annotated diff.

Verdict

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[moirahuang]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [5/5] Handle remote codebase auto-index follow-ups #11092
• [4/5] Add remote codebase incremental sync #11094
• [3/5] Reduce duplicate remote codebase index status pushes #11093
• [2/5] remote codebase indexing telemetry #10985 👈 (View in Graphite)
• [1/5] [Remote codebase indexing] pass embedding configs through #10981
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