fix(dylint): normalize remaining workspace paths

[zackees]

Summary

• migrate the benchmark comparison harness from raw PathBuf fields/helpers to fbuild_core::path::NormalizedPath
• replace benchmark and ESP cache hand-rolled slash rewriting with NormalizedPath::display_slash()
• make the workspace-wide Dylint 6.0.1 scan clean after chore(dylint): upgrade stack to 6.0.1 #1192 exposed these previously hidden violations

Validation

• soldr cargo check -p fbuild-bench-fastled-examples --all-targets
• soldr cargo test -p fbuild-bench-fastled-examples (6 passed)
• soldr cargo test -p fbuild-build-esp cache_key_normalizes_windows_style_project_paths_in_flags
• soldr cargo fmt --all -- --check
• no lint or allowlist changes

Follow-up to #1155 and #1192.

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Review details

⚙️ Run configuration

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Run ID: dfb2a479-f2a8-4637-b0de-6792642a2375

📥 Commits

Reviewing files that changed from the base of the PR and between c3b50db and a5919d9.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• bench/fastled-examples/Cargo.toml
• bench/fastled-examples/src/build_comparison.rs
• bench/fastled-examples/src/build_comparison_tests.rs
• crates/fbuild-build-esp/src/esp32/orchestrator/framework_library_cache.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-1155-dylint-workspace

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