refactor: move Rstest examples to rstest folder

[chenjiahan]

Move some Rstest examples to rstest folder.

[Copilot]

Pull request overview

Moves Rstest-related examples under the rstest/ workspace and standardizes how the Rstest CLI is invoked across several example packages.

Changes:

• Update multiple Rstest example package.json test scripts from rstest run to rstest (and --update accordingly).
• Add a new rstest/rsbuild-react example project (config, source, tests) and rename its package scope/name.
• Remove the previous rsbuild/react-rstest and rsbuild/react-jest example folders/files.

Reviewed changes

Copilot reviewed 23 out of 37 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rstest/snapshot/package.json	Switch snapshot example scripts to rstest / rstest --update.
rstest/rslib-adapter/package.json	Switch test script to rstest.
rstest/rsbuild-svelte/package.json	Switch test script to rstest.
rstest/rsbuild-solid/package.json	Switch test script to rstest.
rstest/rsbuild-react/tsconfig.json	Add TS config for the new rsbuild+react Rstest example.
rstest/rsbuild-react/tests/tsconfig.json	Add test TS config and test environment type definitions.
rstest/rsbuild-react/tests/App.spec.tsx	Add a basic React Testing Library spec.
rstest/rsbuild-react/src/index.tsx	Add React app entrypoint.
rstest/rsbuild-react/src/env.d.ts	Add Rsbuild type references.
rstest/rsbuild-react/src/App.tsx	Add the example React component (imports CSS).
rstest/rsbuild-react/src/App.css	Add basic styling for the example app.
rstest/rsbuild-react/rstest.setup.ts	Add RTL jest-dom setup import.
rstest/rsbuild-react/rstest.config.ts	Add Rstest configuration for the example (currently Rsbuild integration approach differs from other examples).
rstest/rsbuild-react/rsbuild.config.ts	Add Rsbuild configuration for the example.
rstest/rsbuild-react/package.json	Rename package to @rstest-example/rsbuild-react and switch test script to rstest.
rstest/rsbuild-react/README.md	Add usage/readme for the new example.
rstest/rsbuild-react/.gitignore	Add ignores for the new example.
rstest/rsbuild-preact/package.json	Switch test script to rstest.
rstest/rsbuild-adapter/package.json	Switch test script to rstest.
rstest/mocking/package.json	Switch test script to rstest.
rstest/fake-timers/package.json	Switch test script to rstest.
rsbuild/react-rstest/tsconfig.json	Remove old rsbuild react-rstest example file.
rsbuild/react-rstest/tests/App.spec.tsx	Remove old rsbuild react-rstest example test.
rsbuild/react-rstest/src/index.tsx	Remove old rsbuild react-rstest example entrypoint.
rsbuild/react-rstest/src/env.d.ts	Remove old rsbuild react-rstest example env types.
rsbuild/react-rstest/src/App.tsx	Remove old rsbuild react-rstest example component.
rsbuild/react-rstest/src/App.css	Remove old rsbuild react-rstest example CSS.
rsbuild/react-rstest/rsbuild.config.ts	Remove old rsbuild react-rstest example config.
rsbuild/react-rstest/.gitignore	Remove old rsbuild react-rstest example gitignore.
rsbuild/react-jest/tests/tsconfig.json	Remove old rsbuild react-jest example test TS config.
rsbuild/react-jest/tests/mocks/styleMock.js	Remove Jest CSS mock.
rsbuild/react-jest/tests/mocks/fileMock.js	Remove Jest asset mock.
rsbuild/react-jest/package.json	Remove old Jest-based example package.
rsbuild/react-jest/jest.config.ts	Remove Jest config.
rsbuild/react-jest/jest-setup.ts	Remove Jest setup file.
rsbuild/react-jest/README.md	Remove Jest example README.

Comments suppressed due to low confidence (1)

rstest/rsbuild-react/package.json:10

• If this package is intended to run tests using the Rsbuild pipeline (as implied by the presence of rsbuild.config.ts and rstest.config.ts), @rstest/adapter-rsbuild should be included in devDependencies (consistent with other rstest/rsbuild-* examples). Without the adapter, tests may fail to compile/resolve non-JS imports such as src/App.tsx importing ./App.css.

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