feat: implement baseline ratio computation and unit normalization in benchmark reporting

[vbreuss]

This pull request enhances the BenchmarkReport functionality to improve the handling and comparison of benchmark data, especially when working with baselines that may use different units for time and memory. The main changes include normalizing units for accurate ratio calculations, recomputing ratios for baseline rows, and ensuring empty rows are formatted consistently with the table header. Comprehensive tests have been added to verify these behaviors.

Enhancements to Baseline Handling and Ratio Computation:

• Added logic to normalize time and memory units (e.g., ns, μs, ms, KB, MB) to a common base (nanoseconds for time, bytes for memory) for accurate ratio calculations between baseline and current benchmark results.
• Implemented the RecomputeBaselineRatio method to recompute the "Ratio" and "Alloc Ratio" values for baseline rows relative to the current benchmark, ensuring unit differences are handled and results are accurate.

Table Formatting Improvements:

• Modified the table rendering logic to emit empty rows that match the header's column count when separating parameter groups, improving the readability and consistency of the generated tables.

Utility and Helper Improvements:

• Introduced FindColumnIndex for case-insensitive column name lookup, improving robustness when handling table headers.

Testing Enhancements:

• Added and extended tests to verify unit normalization, baseline ratio recomputation, empty row formatting, and column index lookup, ensuring reliability and correctness of new features.

[Copilot]

Pull request overview

Implements baseline ratio recomputation in benchmark PR comment rendering by normalizing time/memory units before computing ratios, ensuring baseline comparisons remain accurate across unit changes.

Changes:

• Recompute injected baseline Ratio and Alloc Ratio values relative to the current Mockolate row.
• Add quantity parsing/normalization to compare values across time (ps/ns/μs/ms/s) and memory (B/KB/MB/GB) units.
• Extend Build.Tests coverage for column lookup, ratio recomputation, and unit normalization behaviors.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Pipeline/BenchmarkReport.cs	Adds unit-normalized quantity parsing and recomputes baseline ratios when injecting baseline rows.
Tests/Build.Tests/BuildBodyTests.cs	Adds end-to-end tests validating recomputed ratios and unit normalization in rendered output.
Tests/Build.Tests/BenchmarkReportHelpersTests.cs	Adds focused helper-method tests for column lookup, ratio recomputation, and quantity parsing.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

DefaultColumnsToRemove was removed from BenchmarkReport, but it is still referenced by the build pipeline (Pipeline/Build.Benchmarks.cs calls BenchmarkReport.DefaultColumnsToRemove). This will break compilation for the Pipeline project. Either restore this constant/field, or update the call site to pass the column list another way (e.g., a local constant or configuration).

Suggested change

	{
	{
	public static readonly string[] DefaultColumnsToRemove = Array.Empty<string>();

[sonarqubecloud]

Quality Gate failed

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[github-actions]

This is addressed in release v3.1.0.