fix(go-runner): implement MatchString testdep

[not-matthias]

• Renamed simpleDeps to TestDeps (like it's done in the testing/internal/testdeps/deps.go file)
• Add comment to clarify where this comes from
• Implement MatchString to be able to filter benchmarks

[codspeed-hq]

CodSpeed Performance Report

Merging #8 will not alter performance

_{Comparing cod-1271-benchmark-filter-doesnt-work (3cc5268) with main (4f8413e)}

Summary

✅ 10 untouched benchmarks

[GuillaumeLagrange]

lgtm, as much as my go knowledge allows me to say so

[Copilot]

Pull Request Overview

This PR implements proper benchmark filtering support in the Go runner by adding a functional MatchString method to the TestDeps implementation. The changes rename the previous simpleDeps struct to TestDeps to align with Go's standard testing package naming conventions and implement regex-based pattern matching for benchmark filtering.

Key changes:

• Replaced simpleDeps with TestDeps struct that properly implements the testDeps interface
• Added functional MatchString method with regex compilation and caching for benchmark filtering
• Removed debug code and cleaned up formatting across both files

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
go-runner/src/builder/template.go	Template file updated with TestDeps implementation and MatchString functionality
example-codspeed/cli/runner.go	Example runner updated to use new TestDeps structure and removed debug output

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