feat: golang dx improvements

[not-matthias]

Note: b.Loop() benchmarks previously reported an incorrect time because rounds was always set to 1. This is why we have a huge performance boost.

[codspeed-hq]

CodSpeed Performance Report

Merging #16 will improve performances by ×26

_{Comparing cod-1330-golang-dx-improvements (9d21400) with main (ce62136)}

Summary

⚡ 7 improvements
✅ 15 untouched

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	BenchmarkQuicktest	178.1 µs	6.8 µs	×26
⚡	BenchmarkWithSlogAssert	203.8 µs	52.6 µs	×3.9
⚡	BenchmarkTestifyWithNew	76.5 µs	7.7 µs	×9.9
⚡	BenchmarkTestifyWithT	40.5 µs	3.7 µs	×11
⚡	BenchmarkFibonacci20_Loop	106.8 µs	68.6 µs	+55.62%
⚡	BenchmarkSleep100ns_Loop	1,104 ns	240 ns	×4.6
⚡	BenchmarkSleep1us_Loop	1.7 µs	1.2 µs	+51.04%

[Copilot]

Pull Request Overview

This PR introduces multiple improvements to the Go benchmarking system including better iteration tracking, improved output ordering, enhanced logging configuration, and adds support for helper functions in benchmarks.

Key changes:

• Enhanced iteration counting logic for both b.N and b.Loop() patterns
• Moved benchmark output formatting before CodSpeed processing for better UX
• Improved import patching to cover all Go files instead of just benchmark files
• Added support for benchmark helper functions with a new test project

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testing/testing/benchmark.go	Enhanced iteration tracking logic and reordered output formatting
go-runner/testdata/projects/example-with-helper/*	New test project demonstrating benchmark helper function support
go-runner/src/results/raw_result.rs	Removed default empty iters_per_round fallback logic
go-runner/src/main.rs	Enhanced logging configuration with default info level
go-runner/src/integration_tests.rs	Added test case for example-with-helper project
go-runner/src/builder/templater.rs	Updated to patch all files instead of specific benchmark files
go-runner/src/builder/patcher.rs	Expanded import patching to cover all Go files
Various snapshot files	Updated test snapshots reflecting changes

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