E2E test coverage for rotate, zoom and reset of 3D model

[koebel]

add E2E test coverage for rotate, zoom and reset of 3D model

• research if it's possible to do assertions related to size and position of the model (camera angle and distance between camera and model)
• if so, add test coverage for this

Previously, these steps had been defined in the Scenario for testing these aspects:

# rotate, zoom and reset 3D model
When the user rotates the model
And the user zooms into the model
Then the size and position of the 3D model should be changed accordingly
When the user resets the viewport
Then the 3D model should be display in the default size and position

When steps in the scenario above were previously implemented in this PR, but removed in these commits because of lacking implementation of assertion in Then steps:

• 412e59e
• eabf724

[koebel]

see also this comment about some of the challenges that were faced when trying to implement this previously: #12 (comment)

[koebel]

Amrita has been suggesting to do the assertion with screenshots, see comment here