Make workflow design better

[christad92]

The epic covers a series of new features and fixes that will make it easier, less frustrating and overall better for users when creating workflows on Lightning.

• Allow users to delete steps with associated runs #2027
• Jump to steps on a different branches (i.e., merge) #2008
• Allow users to delete edges in the middle of a workflow #1208
• Allow auto save when configuring adaptors on the canvas. #1882
• Manage how workflow canvas auto refreshes and results to loss of unsaved changes #2007
• Disable canvas from zooming out automatically when a new job is added to a workflow #2005
• Add zoom control panel to workflow canvas. #2006
• Allow users to save new credentials with hotkey (Ctrl/CMD + S) when adding from adaptor modal #2080

Bugs

• Canvas allows users to add steps while blue-loader bar is in progress, then deletes new steps once loading is done #1881
• Cancelling a credential on a new node removes the whole node #1875
• webhook url does not show in the workflow configuration modal when switching triggers from Cron to Events #2050