* Refactoring the `Raypipeline.run` method - merging it with the `Pipeline.run`
This is to fix#2968
* Bug: variable `i` was already in use
* Removing unused imports
* Removing unused import
* [EMPTY] Re-trigger CI
* Addressing concerns raised pre-review
- Removing the attempt to try to make it without the need for `JoinDocuments` - it is okey to fail without `JoinDocuments` for certain pipelines.
* Refactoring based on reviews
