Aligns how Import and New project flows work (#11184)

* Slight import refactor

* Test updates

* Adds test, sets script name for File extractType to projectName

* generating correct folder list

* Correctly setting serverId for Imports started from Object Explorer

* Adding regression test

* uncommented test check

extensions/sql-database-projects/src/models/project.ts

@@ -37,6 +37,16 @@ export class Project {
 		this.projectFileName = path.basename(projectFilePath, '.sqlproj');
 	}
 
+	/**
+	 * Open and load a .sqlproj file
+	 */
+	public static async openProject(projectFilePath: string): Promise<Project> {
+		const proj = new Project(projectFilePath);
+		await proj.readProjFile();
+
+		return proj;
+	}
+
 	/**
 	 * Reads the project setting and contents from the file
 	 */