hide the gather button while a cell is executing (#12981)

Author: David Kutugata

src/datascience-ui/history-react/interactiveCell.tsx

@@ -189,6 +189,7 @@ export class InteractiveCell extends React.Component<IInteractiveCellProps> {
                     onClick={gatherCode}
                     hidden={
                         this.props.cellVM.cell.state === CellState.error ||
+                        this.props.cellVM.cell.state === CellState.executing ||
                         this.props.cellVM.cell.data.cell_type === 'markdown' ||
                         !this.props.settings.gatherIsInstalled
                     }

src/datascience-ui/native-editor/nativeCell.tsx

@@ -598,6 +598,7 @@ export class NativeCell extends React.Component<INativeCellProps> {
             this.props.cellVM.cell.data.execution_count === null ||
             this.props.cellVM.hasBeenRun === null ||
             this.props.cellVM.hasBeenRun === false ||
+            this.props.cellVM.cell.state === CellState.executing ||
             this.isError() ||
             this.isMarkdownCell() ||
             !this.props.gatherIsInstalled;