Fix progress creation

[tolusha]

Signed-off-by: Anatoliy Bazko abazko@redhat.com

Reference issue

There are duplicated progress entries on status bar.

What does this PR fix

Accordingly to the doc [1] progress is shown while it returned isn't resolved nor rejected. Here is VS Code implementation [2]

[1] /~https://github.com/Microsoft/vscode/blob/1.31.1/src/vs/vscode.d.ts#L6495-L6497

* Show progress in the editor. Progress is shown while running the given callback
* and while the promise it returned isn't resolved nor rejected. The location at which
* progress should show (and other details) is defined via the passed [`ProgressOptions`](#ProgressOptions).

[2] /~https://github.com/Microsoft/vscode/blob/master/src/vs/workbench/api/node/extHostProgress.ts#L25

Related issues

#3771

[benoitf]

@tolusha please remove the two plug-ins binaries before merging