Fix #4356 New Notebook from connection doesn't connect (#4364)

* Fix #4356 New Notebook from connection doesn't connect
Fix new notebook error by passing profile instead of ID.
- I could've just sent the ID over, but this fix sets the stage for disconnected connections to work (since we have enough info to properly connect).
- There's a bug in NotebookModel blocking the disconnected connection part working, but Yurong's in progress fixes will unblock this. Hence checking in as-is and working to properly unblock once that's in.

* Support connection profile in commandline service
- Added new context API for things that want to work on commandline and object explorer
- Refactored commandlineservice slightly to be async & have a simpler execution flow (far fewer if/else statements)

* Fix unit tests
- Fixed 2 issues raised by tests (sholdn't do new query if no profile passed, shouldn't error on new query failing)
- Updated unit tests to pass as expected given changes to the APIs.

extensions/notebook/src/integrationTest/notebookIntegration.test.ts

@@ -65,11 +65,11 @@ describe('Notebook Integration Test', function (): void {
 		await ensureJupyterInstalled();
 
 		// Given a connection to a server exists
-		let connectionId = await connectToSparkIntegrationServer();
+		let connectionProfile = await connectToSparkIntegrationServer();
 
 		// When I open a Spark notebook and run the cell
 		let notebook = await azdata.nb.showNotebookDocument(uri, {
-			connectionId: connectionId
+			connectionProfile: connectionProfile
 		});
 		should(notebook.document.cells).have.length(1);
 		let ran = await notebook.runCell(notebook.document.cells[0]);
@@ -90,7 +90,7 @@ describe('Notebook Integration Test', function (): void {
 	});
 });
 
-async function connectToSparkIntegrationServer(): Promise<string> {
+async function connectToSparkIntegrationServer(): Promise<azdata.IConnectionProfile> {
 	assert.ok(process.env.BACKEND_HOSTNAME, 'BACKEND_HOSTNAME, BACKEND_USERNAME, BACKEND_PWD must be set using ./tasks/setbackenvariables.sh or .\\tasks\\setbackendvaraibles.bat');
 	let connInfo: azdata.connection.Connection = {
 		options: {
@@ -114,7 +114,7 @@ async function connectToSparkIntegrationServer(): Promise<string> {
 	let activeConnections = await azdata.connection.getActiveConnections();
 	should(activeConnections).have.length(1);
 
-	return result.connectionId;
+	return <azdata.IConnectionProfile><any>connInfo;
 }
 
 function writeNotebookToFile(pythonNotebook: INotebook): vscode.Uri {