Rename `Reset` button on Workflow Page to `Restore` and add a `Clear` button

[harshit-soora]

Related to Epic #4338

Currently, the Reset button on Workflow reset the workflow to empty state. We want to update this functionality as follows:

• Restore Button : Fetch model storage for last saved state of the workflow. It should also restore the session to make the next reload consistent with backend storage

• Clear Button : Clear both session and storage

The session in workflow gets updated every-time you do something on show page (add edge, delete, move launcher etc.)
Reloading workflow show page will get the latest state of workflow among the session and backend model storage.