remove project feature (#12297)

* remove project feature

* update test

extensions/sql-database-projects/src/projectProvider/projectProvider.ts

@@ -24,6 +24,16 @@ export class SqlDatabaseProjectProvider implements dataworkspace.IProjectProvide
 		return provider;
 	}
 
+	/**
+	 * Callback method when a project has been removed from the workspace view
+	 * @param projectFile The Uri of the project file
+	 */
+	RemoveProject(projectFile: vscode.Uri): Promise<void> {
+		// No resource release needed
+		console.log(`project file unloaded: ${projectFile.fsPath}`);
+		return Promise.resolve();
+	}
+
 	/**
 	 * Gets the supported project types
 	 */