Enforce release builds for benchmarks and simplify command interface

[Copilot]

This PR ensures that benchmarks run with release builds by default for meaningful performance measurements, while simplifying the command interface and supporting debug builds for profiling purposes.

Changes Made

Justfile Updates:

• Removed unnecessary target parameter from bench and bench-ci commands since they only accept release builds
• Simplified command signatures to just bench [features] and just bench-ci baseline [features]
• Commands always use --profile=release for consistent performance measurements

GitHub Workflows Updates:

• Updated Benchmarks.yml and dep_rust.yml to use simplified command signatures
• Removed redundant target parameter usage while maintaining same functionality

Benchmark Code Changes:

• Removed compile-time error that prevented running benchmarks with debug symbols
• Enables profiling capabilities while maintaining release build defaults

Documentation:

• Updated docs/benchmarking-hyperlight.md to clarify that just bench uses release builds by default
• Documented that developers can use cargo bench directly for profiling with debug symbols

Behavior

The changes maintain the same core behavior while providing a cleaner interface:

1. Release builds by default - just bench consistently uses release profile for meaningful results
2. Simplified commands - No confusing parameters that only accept one value
3. Profiling flexibility - Developers can compile benchmarks with debug symbols by calling cargo bench directly

Examples

# Clean, simple interface
just bench                    # Run benchmarks with release builds
just bench mshv2             # Run with specific features
just bench-ci baseline       # Compare against baseline

# Advanced usage for profiling
cargo bench                  # Compile with current profile
cargo bench --profile dev    # Debug symbols for profiling

Backward Compatibility

All existing workflows continue to work without modification. The changes are purely simplifications that remove unnecessary complexity while preserving all functionality and adding profiling flexibility.

Fixes #638.

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[jsturtevant]

This seems like a much more sane approach than the previous iteration....

change was made