[Mirror] [ENH](wal3): add optional upload fault injector (upstream #6849)

[hashbender]

Mirrored from chroma-core#6849 for Tenki Code Review demo

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[hashbender]

@tenki-reviewer

[tenki-reviewer]

Tenki Code Review - Complete

Files Reviewed: 12
Findings: 0

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I reviewed the PR changes across the new fault-injection plumbing and WAL3 integration, and did not identify actionable code-quality or security issues reachable with current callers. The changes appear internally consistent and feature-gated where behavior changes occur.

Files Reviewed (12 files)

Cargo.toml
idl/chromadb/proto/fault_injection.proto
rust/config/src/registry.rs
rust/faults/Cargo.toml
rust/faults/src/lib.rs
rust/log-service/Cargo.toml
rust/log-service/src/lib.rs
rust/types/build.rs
rust/wal3/src/interfaces/mod.rs
rust/wal3/src/interfaces/repl/mod.rs
rust/wal3/src/interfaces/s3/mod.rs
rust/wal3/src/lib.rs