* Add coverage enforcement for test projects
* Expand GitHub Actions triggers to include additional branch patterns
* Update `coverlet.msbuild` configuration and centralize dependency version management
- Removed inline version specification for `coverlet.msbuild` in `test/Directory.Build.props`.
- Centralized `coverlet.msbuild` version definition in `Directory.Packages.props` for consistency and maintainability.
* Remove `Elsa.Common.Core` unit test project and related test files
* Add Directory.Build.props for test project organization and update property configurations
- Introduced `Directory.Build.props` files for `test/unit` and `test/integration` to define project-specific properties.
- Updated `test/Directory.Build.props` to include new coverage formats and an exclusion for `Elsa.Testing.Shared`.
- Adjusted solution file to link new `Directory.Build.props` files.
- Configured threshold properties for `unit`, `integration`, and `component` test directories.
* Disable coverage collection for performance tests in project file
* Expand GitHub Actions workflow triggers and add PR-specific condition for test job
