feat(ci): dependency-DAG-based test scoping for Rust CI

[krishvishal]

Which issue does this PR close?

Closes #3094

Summary

• Use cargo-rail to compute affected crates via the workspace dependency DAG, then scope cargo build and cargo nextest run to only those crates
• Fix two detection blind spots: core/iobuf and core/server-ngwere not covered by any component incomponents.yml`
• Split rust-simulator out of rust-cluster so simulator-only changes don't trigger Python/Node/Go/Java/C# SDK tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.71%. Comparing base (44eea40) to head (2df34ff).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3095      +/-   ##
============================================
- Coverage     72.75%   72.71%   -0.05%     
  Complexity      943      943              
============================================
  Files          1117     1117              
  Lines         96342    96342              
  Branches      73540    73559      +19     
============================================
- Hits          70096    70054      -42     
- Misses        23696    23718      +22     
- Partials       2550     2570      +20     

Components	Coverage Δ
Rust Core	73.49% <ø> (-0.04%)	⬇️
Java SDK	62.30% <ø> (ø)
C# SDK	69.10% <ø> (-0.31%)	⬇️
Python SDK	81.43% <ø> (ø)
Node SDK	91.40% <ø> (-0.04%)	⬇️
Go SDK	38.97% <ø> (ø)
see 19 files with indirect coverage changes

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