Introduced `DistributedWorkflowRuntime` to support distributed workflow execution with locking mechanisms. Added new module `Elsa.Workflows.Runtime.Distributed` with key services, features, and client implementations for handling distributed bookmarks and workflow clients. Updated integration and component tests to use the new distributed runtime where relevant.
Eliminated the `Elsa.Labels`, `Elsa.Environments`, and `Elsa.OpenTelemetry` modules along with their handlers, contracts, models, and related functionality. This cleanup improves maintainability and aligns the codebase with recent architectural changes.
- Removed `ElsaStudioVersion` from `Directory.Build.props`.
- Added `PackageVersions` group in `Directory.Packages.props` with `ElsaStudioVersion` and new `Moq` package version.
- Updated input retrieval method in `ConfigureLiquidEngine.cs` to use `ActivityInput`.
- Clarified import for `InvokingActivityCallback` in `ScheduledChildCallbackBehavior.cs`.
- Changed target framework to `net9.0` in `Elsa.Http.UnitTests.csproj` and updated package references for flexibility.
