Nb/show notebooks as untitled (#6376)

* open notebooks as untitled files and removed the saving to home directory

* return just filename without extension since save is adding the .ipynb ext

* Changes to open bdc notebooks as untitled docs. Updated tests to align with the changes

* changes: not to show untitled file as dirty and cleaned up tests in notebookService

* changes to address untitled name conflicts with open editors.

* comment cleanup

src/sql/workbench/api/browser/mainThreadNotebookDocumentsAndEditors.ts

@@ -460,6 +460,9 @@ export class MainThreadNotebookDocumentsAndEditors extends Disposable implements
 			let untitledModel = await input.textInput.resolve();
 			await untitledModel.load();
 			input.untitledEditorModel = untitledModel;
+			if (options.initialDirtyState === false) {
+				input.untitledEditorModel.setDirty(false);
+			}
 		}
 		let editor = await this._editorService.openEditor(input, editorOptions, viewColumnToEditorGroup(this._editorGroupService, options.position));
 		if (!editor) {

src/sql/workbench/api/node/extHostNotebookDocumentsAndEditors.ts

@@ -206,6 +206,7 @@ export class ExtHostNotebookDocumentsAndEditors implements ExtHostNotebookDocume
 					options.initialContent = showOptions.initialContent;
 				}
 			}
+			options.initialDirtyState = showOptions.initialDirtyState;
 		}
 		let id = await this._proxy.$tryShowNotebookDocument(uri, options);
 		let editor = this.getEditor(id);

src/sql/workbench/api/node/sqlExtHost.protocol.ts

@@ -908,6 +908,7 @@ export interface INotebookShowOptions {
 	connectionProfile?: azdata.IConnectionProfile;
 	defaultKernel?: azdata.nb.IKernelSpec;
 	initialContent?: string;
+	initialDirtyState?: boolean;
 }
 
 export interface ExtHostNotebookDocumentsAndEditorsShape {