Add unit test/component testing of WebvizDialog-component

[jorgenherje]

Add unit tests/component testing of WebvizDialog-component

Test:

• Unit test functionality
• Dragging/Panning of component
• Resize of window/view portal to verify resize

---

Possible Frameworks:

• Cypress
  • Used in webviz-subsurface-components with end-to-end testing of Storybook) - a goto framework for Emerson?
  • Seems to be dependent on object/elements for drag/pan - i.e. no direct mouse interaction on x- and y-coordinates?
    • E.g. activate mouse down on one element and activate mouse up on another element - a way of testing drag/drop from a source tree to another container (HTMLElement)
• Playwright
  • Seems to have better drag/pan interaction
  • Can utilize bounding client of objects to get position HTML elements and perform mouse interaction with the respective positions