Feature/nodes to api v2 (#466)
* add nodes endpoint for api/v2
* add node models for api/v2
* adjust functions and fields according to new models
* add error handling
* add correct number of nodes
* start adjust testing
* start adjust testing
* fix linting error
* fix test in aws add node component
* fix testing add node component DO , testing for nodesizes missing
* fix testing add node component openstack
* fix testing connect popup
* Fix testing cluster provider AWS, DO, OS
* fix linting
* delete test for getting digitalocean sizes
* fix test for SetClusterNameComponent
* fix test for SetProviderComponent
* Fix testing ProviderClusterComponent
* fix test for SetDatacenterComponent
* add drone
* drone run test
* reverse changes
* adjust displayName, summary page and nodeList
* fix linting
* show readable digitalocean sizes in summary
* reactivate missing add nodes button
* fix error while adding a node
* temporary delete testing from node
* adjust codebase
* fix bug when deleting nodes: wrong name was used
* adjust notifications when creating nodes
* reload nodes after deletion
* pass whole node when deleting nodes
* fi testing node delete confirmation component
* fix node component linting
* Show error message if available
* cluster list: column width
* remove unused code
* Cluster Details Page PopUp Buttons Wording
* refactoring delete node button / spinner
* fix node delete test and onNodeRemoval function from node group component
