test(e2e): add test cases for preserve JSX runtime

[chenjiahan]

Summary

• Add test cases for preserve JSX runtime mode
• Update test descriptions to be more concise

Checklist

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

[Copilot]

Pull Request Overview

This PR adds test cases for preserve JSX runtime mode and standardizes test descriptions by making them more concise. The changes primarily focus on testing React JSX runtime configurations and improving test readability.

• Add comprehensive test coverage for preserve JSX runtime mode including new test files and configuration
• Update test descriptions across multiple files to use shorter, more consistent naming (e.g., "in dev" instead of "in development correctly")
• Replace legacy JSX test with classic JSX runtime test to better reflect current testing needs

Reviewed Changes

Copilot reviewed 14 out of 17 changed files in this pull request and generated 1 comment.

File	Description
e2e/cases/plugin-react/jsx-runtime-preserve/	New test case for preserve JSX runtime with complete React app setup
e2e/cases/plugin-react/jsx-runtime-classic/index.test.ts	New test for classic JSX runtime replacing legacy JSX test
e2e/cases/plugin-react/legacy-jsx/index.test.ts	Removed legacy JSX test file
Multiple test files	Updated test descriptions to be more concise and consistent

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[Copilot]

The parentheses around await content are unnecessary. The await operation has higher precedence than the method call, so this can be simplified to expect((await content).includes('<div id="test">Hello Rsbuild!</div>')).toBeTruthy(); or better yet, use a more specific assertion like expect(await content).toContain('<div id="test">Hello Rsbuild!</div>');

Suggested change

	expect(
	(await content).includes('<div id="test">Hello Rsbuild!</div>'),
	).toBeTruthy();
	expect(await content).toContain('<div id="test">Hello Rsbuild!</div>');

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