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This is needed because we have to know before hand if the group has subgroups. If the group doesn’t have subgroups we will not let the user to click a group row to fetch subgroups, also we will hide caret icon which is used to indicate the row can be expanded.

Also adds more tests fro groups folder component

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Tree object is an array now.

- All groups are displayed at the top level
- To access subgroups now we have to click every parent which will make a request to fetch sub groups.

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