fix(browserLogs): correct source path resolution

[chenjiahan]

Summary

Rsbuild users can modify the source paths in source maps via Rspack's output.devtoolModuleFilenameTemplate option.

This PR improves the browser log parsing logic to correctly handle both absolute and relative paths.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR fixes the browser log parsing logic to correctly resolve source paths in source maps, supporting both absolute and relative paths that may be customized via Rspack's output.devtoolModuleFilenameTemplate option.

Key Changes:

• Introduced a new helper function getRelativeSourcePath to normalize both absolute and relative source paths before computing the path relative to the project root
• Added comprehensive test coverage with two test cases validating both absolute and relative source path scenarios

Reviewed Changes

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

File	Description
packages/core/src/server/browserLogs.ts	Added getRelativeSourcePath helper function to handle both absolute and relative source paths, replacing direct path.relative call
e2e/cases/browser-logs/custom-source-map/src/index.js	Added minimal test source file that throws an error for testing source map resolution
e2e/cases/browser-logs/custom-source-map/index.test.ts	Added test cases validating source map parsing with both absolute and relative path configurations

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