Updated Postgres Spec for where to find engine version, removed calling calling -ev in edit commands (#14735)

* Added spec.engine.version, took out calling engine version with edit calls

* Added text wrong place

* missed updates

* PR fix

extensions/arc/src/test/models/postgresModel.test.ts

@@ -41,7 +41,8 @@ export const FakePostgresServerShowOutput: azdataExt.AzdataOutput<azdataExt.Post
 				extensions: [{ name: '' }],
 				settings: {
 					default: { ['']: '' }
-				}
+				},
+				version: ''
 			},
 			scale: {
 				shards: 0,