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.

src/sql/parts/notebook/models/notebookModel.ts

@@ -408,6 +408,10 @@ export class NotebookModel extends Disposable implements INotebookModel {
 			}
 			let profile = new ConnectionProfile(this._notebookOptions.capabilitiesService, this.connectionProfile);
 
+			// TODO: this code needs to be fixed since it is called before the this._savedKernelInfo is set.
+			// This means it always fails, and we end up using the default connection instead. If you right-click
+			// and run "New Notebook" on a disconnected server this means you get the wrong connection (global active)
+			// instead of the one you chose, or it'll fail to connect in general
 			if (this.isValidConnection(profile)) {
 				this._activeConnection = profile;
 			} else {