Fix New Notebook issues (#5958)

* Fix New Notebook issues
- Fix #5338 New Notebook menu item should be next to New Query
- Fix #4936 Add a shortcut to create a notebook in the document well

Created a built-in New Notebook command
that routes to the existing extension-based command.
This avoided a rearchitecture that was more complex that seemed worth it.
Per VSCode patterns, used a _ modifier for the existing command so it's "private"

src/vs/workbench/contrib/watermark/browser/watermark.ts

@@ -31,6 +31,7 @@ import { IDimension } from 'vs/platform/layout/browser/layoutService';
 
 // {{SQL CARBON EDIT}}
 import { OpenDataExplorerViewletAction } from 'sql/workbench/parts/dataExplorer/browser/dataExplorer.contribution';
+import { NewNotebookAction } from 'sql/workbench/parts/notebook/notebookActions';
 
 const $ = dom.$;
 
@@ -42,14 +43,18 @@ interface WatermarkEntry {
 
 // {{SQL CARBON EDIT}}
 const showServers: WatermarkEntry = {
-	text: nls.localize('watermark.showServers', 'Show Servers'),
+	text: nls.localize('watermark.showServers', "Show Servers"),
 	id: OpenDataExplorerViewletAction.ID
 };
 
 const newSqlFile: WatermarkEntry = {
-	text: nls.localize('watermark.newSqlFile', 'New SQL File'),
+	text: nls.localize('watermark.newSqlFile', "New SQL File"),
 	id: GlobalNewUntitledFileAction.ID
 };
+const newNotebook: WatermarkEntry = {
+	text: nls.localize('watermark.newNotebook', "New Notebook"),
+	id: NewNotebookAction.ID
+};
 
 const showCommands: WatermarkEntry = {
 	text: nls.localize('watermark.showCommands', "Show All Commands"),
@@ -101,12 +106,14 @@ const startDebugging: WatermarkEntry = {
 const noFolderEntries = [
 	showServers,
 	newSqlFile,
+	newNotebook,
 	findInFiles
 ];
 
 const folderEntries = [
 	showServers,
 	newSqlFile,
+	newNotebook,
 	findInFiles
 ];
 // {{SQL CARBON EDIT}} - End