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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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Set property defaults and match JS variable naming conventions

- GroupFilterableList extends from FilterableList which is used in other places that doesn’t use Vue.
- GroupFilterableList interacts with a Vue store object.
- Deleted groups_list.js since is not needed anymore, filtering is handled via ajax in GroupFilterableList

- Adds Groups component
- Adds GroupItem component

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add enableMap to gl.GfmAutoComplete for partial re-use --  EE backport

See merge request !11073