chore: upgrade tonic and prost to 0.14

[mingley]

Summary

• Upgrade tonic to 0.14 and prost to 0.14.
• Adopt the tonic-prost runtime/codegen split and select the ring TLS backend.
• Regenerate protobuf clients and remove clones made redundant by prost 0.14 generated Copy types.

This advances the dependency alignment described in roadmap issue #506.

Testing Done

• Local code review completed
• make check
• cargo test --workspace — 116 passed, 0 failed
• cargo test --workspace --no-default-features — 116 passed, 0 failed
• make doc — passed
• PD_ADDRS=127.0.0.1:2379 MULTI_REGION=1 RUST_LOG=info NEXTEST_PROFILE=ci cargo nextest run --config-file config/nextest.toml --all --features integration-tests --test-threads 1 — 128 passed, 0 failed
• PD_ADDRS=127.0.0.1:2379 MULTI_REGION=1 RUST_LOG=info NEXTEST_PROFILE=ci cargo nextest run --config-file config/nextest.toml --test failpoint_tests --features 'integration-tests fail/failpoints' --test-threads 1 — 6 passed, 0 failed

Summary by CodeRabbit

• Improvements
  • Updated communication and protocol components for improved compatibility and maintainability.
  • Reduced unnecessary timestamp copying during transaction, lock-resolution, commit, rollback, scanning, and heartbeat operations.
  • Improved handling of uncertain regional outcomes and dispatch errors, including configurable terminal responses and more consistent retry behavior.
  • Preserved existing transaction behavior and public APIs.

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ℹ️ Recent review info

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Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: c2979ccc-c560-4618-a6a6-878a6c71ad60

📥 Commits

Reviewing files that changed from the base of the PR and between db9551b and 29db2f8.

⛔ Files ignored due to path filters (21)

• src/generated/backup.rs is excluded by !**/generated/**
• src/generated/cdcpb.rs is excluded by !**/generated/**
• src/generated/coprocessor.rs is excluded by !**/generated/**
• src/generated/deadlock.rs is excluded by !**/generated/**
• src/generated/encryptionpb.rs is excluded by !**/generated/**
• src/generated/errorpb.rs is excluded by !**/generated/**
• src/generated/import_sstpb.rs is excluded by !**/generated/**
• src/generated/keyspacepb.rs is excluded by !**/generated/**
• src/generated/kvrpcpb.rs is excluded by !**/generated/**
• src/generated/logbackup.rs is excluded by !**/generated/**
• src/generated/meta_storagepb.rs is excluded by !**/generated/**
• src/generated/metapb.rs is excluded by !**/generated/**
• src/generated/mpp.rs is excluded by !**/generated/**
• src/generated/pdpb.rs is excluded by !**/generated/**
• src/generated/raft_cmdpb.rs is excluded by !**/generated/**
• src/generated/raft_serverpb.rs is excluded by !**/generated/**
• src/generated/resource_manager.rs is excluded by !**/generated/**
• src/generated/resource_usage_agent.rs is excluded by !**/generated/**
• src/generated/schedulingpb.rs is excluded by !**/generated/**
• src/generated/tikvpb.rs is excluded by !**/generated/**
• src/generated/tsopb.rs is excluded by !**/generated/**

📒 Files selected for processing (3)

• src/request/plan.rs
• src/transaction/transaction.rs
• src/transaction/transaction/scanner.rs

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

This PR updates the tonic/prost toolchain and protobuf generation, adds terminal handling for undetermined and dispatch errors, and removes unnecessary timestamp and region-epoch clones across transaction and lock-resolution paths.

Changes

gRPC, retry, and timestamp updates

Layer / File(s)	Summary
Protobuf dependency and generation migration Cargo.toml, proto-build/Cargo.toml, proto-build/src/main.rs	The tonic/prost dependencies and TLS features are upgraded. Protobuf generation switches to tonic-prost-build with PathBuf include paths.
Terminal multi-region retry handling src/request/plan.rs	Undetermined results and dispatch-stage gRPC errors receive configurable terminal handling. Undetermined errors retain precedence over determinate shard errors. Tests cover classification, retries, terminal returns, cache invalidation, and error precedence.
Lock resolution and timestamp passing src/request/plan.rs, src/transaction/client.rs, src/transaction/transaction.rs, src/transaction/transaction/scanner.rs	Lock resolution, transaction operations, scans, heartbeats, commits, and rollbacks pass timestamp values directly instead of cloning them. Shared-lock validation occurs before async-commit filtering.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 29db2

The dependency and generated-client updates pass the listed checks and tests, and no actionable merge-blocking risk remains beyond normal review.

Suggested reviewers: eduralph

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 55.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the primary change: upgrading the tonic and prost dependencies to version 0.14.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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