test(e2e): replace manual file lookup with helpers

[chenjiahan]

Summary

Simplify test files by introducing the new findFIle and getFileContent helpers to find and read files instead of manual lookup logic.

Checklist

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

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[Copilot]

Pull Request Overview

This PR simplifies E2E test files by introducing two new helper functions (findFile and getFileContent) to replace manual file lookup logic throughout the test suite. The changes reduce code duplication and improve maintainability of file operations in tests.

• Adds findFile and getFileContent helper functions with hash-aware file matching
• Removes unused plugins parameter from the build/dev API functions
• Standardizes plugin configuration to be consistently placed under config.plugins

Reviewed Changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
e2e/helper/utils.ts	Adds new file helper functions with type definitions and hash pattern matching
e2e/helper/jsApi.ts	Removes unused plugins parameter from build/dev functions and simplifies createRsbuild
e2e/cases/polyfill/helper.ts	Refactored to use new findFile helper instead of manual file lookup
Various test files	Updated to use getFileContent helper and moved plugins to config object
Various config files	Added missing plugin imports to rsbuild.config.ts files

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