* Restore EF Core persistence layer
Originally, we had moved EF Core to the extensions repo, but in practice this turned out to be rather impractical when debugging elsa-core, given that we would lose all of the state (workflow definitions, instances, etc.) across application restarts.
* Integrate PostgreSQL support into EF Core persistence and enhance BlobStorage workflows provider setup.
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.
* Delete DefaultWorkflowInvoker.cs
* Incremental work
* Refactor runtime
* Implement workflow state store + bookmark store
* Cleanup
* Update migrations
* Move store abstractions to management and runtime projects
* Consolidate persistence providers into single package
* Generate migrations
* Regenerate migrations
* Fix DI of memory stores
* Update migrations
* Refactor definition reference due to unserializable record
* Update web server bundle to use EF core by default
* Update Bookmark.cs
Fixes System Text Json deserialization
