refactor: remove file descriptor limit setting functionality

[bronzelle-cw]

Summary

This PR removes the automatic file descriptor limit setting functionality while preserving the checking and warning capabilities.

Background

In a previous PR, we implemented functionality to:

1. Check file descriptor limits
2. Automatically set new file descriptor limits if they were below the threshold

After the previous PR was merged to main, we encountered issues with the automatic setting functionality and decided to remove that part while keeping only the checking functionality.

Changes

• Removed create_file_descriptor_error_message function
• Removed set_file_descriptor_limit function that attempted to automatically increase file descriptor limits
• Simplified get_current_file_descriptor_limit to only retrieve current limits
• Updated check_file_descriptor_limit to only check and warn about insufficient limits, returning an error instead of attempting to fix them automatically
• Removed test case for the automatic setting functionality

Behavior Change

Before: If file descriptor limit was below threshold, Stratus would attempt to automatically increase it.

After: If file descriptor limit is below threshold, Stratus will log a warning and return an error, requiring manual intervention.

Testing

• Existing unit tests pass
• The file descriptor limit checking functionality remains intact
• Manual testing shows appropriate warnings are logged when limits are insufficient

This approach is safer as it avoids potential system-level modifications and clearly communicates to users when manual configuration is needed.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.54%. Comparing base (bc8779c) to head (e2598c5).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/eth/storage/permanent/rocks/rocks_permanent.rs	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2281      +/-   ##
==========================================
+ Coverage   84.14%   84.54%   +0.39%     
==========================================
  Files         129      129              
  Lines       10409    10395      -14     
==========================================
+ Hits         8759     8788      +29     
+ Misses       1650     1607      -43     

Flag	Coverage Δ
contracts-rocks-	45.31% <25.00%> (+0.04%)	⬆️
e2e-admin-password	22.57% <25.00%> (?)
e2e-clock-stratus	25.40% <25.00%> (+0.04%)	⬆️
e2e-genesis	26.93% <25.00%> (+0.05%)	⬆️
e2e-importer-offline	59.86% <25.00%> (+0.08%)	⬆️
e2e-rpc-downloader	54.77% <25.00%> (-0.06%)	⬇️
e2e-stratus	56.23% <25.00%> (+0.08%)	⬆️
leader-follower-	62.92% <25.00%> (+0.68%)	⬆️
rust-tests	29.66% <62.50%> (-0.34%)	⬇️

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[stratus-benchmark]

Final benchmark:
Run ID: bench-ad654e68

Git Info:

• Branch: main
• Commit: 73b44b5
• PR: refactor: remove file descriptor limit setting functionality #2281

Leader Stats:
RPS Stats: Max: 6798.00, Min: 3848.00, Avg: 6124.92, StdDev: 260.73
TPS Stats: Max: 3356.00, Min: 665.00, Avg: 3057.00, StdDev: 178.94

Follower Stats:
Imported Blocks/s: Max: 12.00, Min: 2.00, Avg: 7.96, StdDev: 2.03
Imported Transactions/s: Max: 28085.00, Min: 6028.00, Avg: 20332.01, StdDev: 3809.70

Plots:

• View Leader Plot
• View Follower Plot