src/vs/workbench/contrib/notebook/browser/services/notebookExecutionStateServiceImpl.ts/CellExecution/initialize
class CellExecution:	initialize() {
		const startExecuteEdit: ICellEditOperation = {
			editType: CellEditType.PartialInternalMetadata,
			handle: this.cellHandle,
			internalMetadata: {
				runStartTime: null,
				runEndTime: null,
				lastRunSuccess: null,
				executionOrder: null,
			}
		};
		this._applyExecutionEdits([startExecuteEdit]);
	}