feat: reload server when tsconfig.json is changed

[chenjiahan]

Summary

The paths field in tsconfig.json affects the build result, so when the content of tsconfig.json changes, Rsbuild should reload the dev server to load the new tsconfig.json. This PR adds the paths of tsconfig.json files to dev.watchFiles to achieve this.

Checklist

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

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[Copilot]

Pull Request Overview

This PR enables the development server to automatically reload when the contents of tsconfig.json change, thereby ensuring that customizable paths defined within the tsconfig file apply to the build process. Key changes include:

• Adding logic in initConfigs.ts to track and watch tsconfig.json file paths.
• Renaming the variable from process to childProcess across multiple test files for clarity.
• Introducing and updating test cases to validate the automatic reload behavior.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/core/src/provider/initConfigs.ts	Adds tsconfigPaths tracking and updates the dev.watchFiles logic to trigger reload.
e2e/cases/plugin-api/plugin-on-exit-hook/index.test.ts	Renames variable to childProcess to avoid conflicts when terminating processes.
e2e/cases/cli/reload-config/index.test.ts	Updates variable name from process to childProcess for consistent process handling.
e2e/cases/cli/build-watch/index.test.ts	Applies the renaming change for clarity in asynchronous process handling.
e2e/cases/cli/build-watch-restart/index.test.ts	Similar renaming adjustment to improve clarity and consistency.
e2e/cases/alias/tsconfig-paths-reload/tsconfig.json	Introduces a new tsconfig file used for testing tsconfig paths reload behavior.
e2e/cases/alias/tsconfig-paths-reload/src/index.ts	Validates aliasing and DOM manipulation based on tsconfig changes.
e2e/cases/alias/tsconfig-paths-reload/src/foo/test.ts	Provides a source module for alias testing.
e2e/cases/alias/tsconfig-paths-reload/src/bar/test.ts	Provides an alternative source module for alias testing.
e2e/cases/alias/tsconfig-paths-reload/rsbuild.config.ts	Updates build configuration to use the temporary tsconfig for testing reload logic.
e2e/cases/alias/tsconfig-paths-reload/index.test.ts	Validates that the server reloads correctly when tsconfig changes.