test: use Rstest projects

[9aoy]

Summary

Use the Rstest projects to run multiple test projects together instead of run tests independently in sub-packages.

https://rstest.rs/config/test/projects

Related Links

#1090

Checklist

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

[Copilot]

Pull Request Overview

This PR migrates the Rstest configuration to use the new projects feature instead of running tests independently in sub-packages. The main changes restructure the test configuration to leverage Rstest's workspace projects functionality for better test organization.

• Replaces the workspace-based configuration with a new projects-based approach using Rstest's projects feature
• Updates all package references from rstest.workspace to rstest.config
• Upgrades @rstest/core from version 0.3.0 to 0.3.1 across all templates and fragments

Reviewed Changes

Copilot reviewed 26 out of 27 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
rstest.config.ts	New main configuration file implementing projects-based test setup
rstest.workspace.ts	Removed old workspace configuration file
tests/rstest.config.ts	Updated import path to use new config structure
packages/*/rstest.config.ts	Updated import paths in package-level configurations
package.json files	Upgraded @rstest/core version and updated test scripts to use project-specific commands
packages/core/tests/config.test.ts	Added root configuration for proper project context

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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