fixed issue with add model group modal
- fixed search in add model group modal
- moved searchbar to components
- on props.modelGroupId provided, gets groupname and default models on the right from store -> can be used as edit model group members modal
- improved performance of search bar (only searches on enter and onblur)
- updated tests
-> 50% testing coverage in addmodelgroupmodal -> 100% test coverage in searchbar