Upgrade tonic to 0.14.3, tonic-reflection and tonic-health to 0.14.3

[Copilot]

• Identify CI failure: Lint job failing due to dead code (copy_task_by_range) and test failures (missing gRPC framing)
• Fix dead code lint: Add #[allow(dead_code)] to copy_task_by_range in content_linux.rs and content_macos.rs
• Fix test failures: Add gRPC framing (5-byte header) when using then.bytes() in dfget tests
• Run cargo fmt --all -- --check to verify formatting
• Run cargo clippy --all --all-targets -- -D warnings to verify lint
• Run tests for dfget to verify test fixes
• Run code review and CodeQL checks

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[BraveY]

LGTM

[EvanCley]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.53%. Comparing base (c6a2b95) to head (00646ce).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client/src/grpc/dfdaemon_download.rs	0.00%	1 Missing ⚠️
dragonfly-client/src/grpc/dfdaemon_upload.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1721      +/-   ##
==========================================
- Coverage   50.29%   46.53%   -3.76%     
==========================================
  Files          86       86              
  Lines       21977    24749    +2772     
==========================================
+ Hits        11053    11517     +464     
- Misses      10924    13232    +2308     

Files with missing lines	Coverage Δ
dragonfly-client-backend/src/hdfs.rs	40.90% <ø> (ø)
dragonfly-client-backend/src/http.rs	96.97% <ø> (ø)
dragonfly-client-backend/src/hugging_face.rs	35.49% <ø> (ø)
dragonfly-client-backend/src/lib.rs	96.30% <ø> (ø)
dragonfly-client-backend/src/model_scope.rs	42.72% <ø> (ø)
dragonfly-client-backend/src/object_storage.rs	88.77% <ø> (ø)
dragonfly-client-storage/src/content_linux.rs	78.96% <ø> (+0.19%)	⬆️
dragonfly-client-util/src/pool/mod.rs	80.18% <ø> (ø)
dragonfly-client-util/src/request/mod.rs	45.32% <ø> (ø)
dragonfly-client-util/src/request/selector.rs	84.06% <ø> (ø)
... and 3 more

... and 33 files with indirect coverage changes

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