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Related to #1303

Description of the change:

Graph Layout was previously failing due to undefined Controller (i.e. via getController func). My speculation is that as new Model (i.e. on discovery tree refresh) is set on the controller, old graph elements are still animating, thus causing the issue. The combination of the following changes seem to fix:

• Debounce (100ms) discovery tree refresh when new target events are emitted. Optional but nice to have.
• Destroy graph layout before setting new model.

Minor changes

Changes	Description	Screenshot
Reset view should expand all collapsed groups	A quick way to re-expand all collapsed groups. Previously, manual unpacking for each group is required	N/A
Alert and resolver for nodes should be rendered as a vertical list and action button is now inline with sentence	Previously, Flex renders them inline (horizontally) if enough width is available
Destroy old graph before initializing new model	Previously, stale elements are causing a recursive fails on graph layouts	N/A
Set Menu Max Height for filter select menus	Previously, the menu can become very long and overflow the view