Description of problem:

The finally tasks do not get removed and remain in the pipeline.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Create a finally task in a pipeline in pipeline builder
2. Save pipeline
3. Edit pipeline and remove finally task in pipeline builder
4. Save pipeline
5. Observe that the finally task has not been removed

Actual results:

The finally tasks do not get removed and remain in the pipeline.

Expected results:

Finally task gets removed from pipeline when removing the finally tasks and saving the pipeline in the "pipeline builder" mode.

Reproducibility (Always/Intermittent/Only Once):

Always

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

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