migrate from gorp to sqlx for Preference store (#18742)

Automatic Merge

app/plugin_api_tests/test_db_driver/main.go

@@ -37,7 +37,9 @@ func (p *MyPlugin) MessageWillBePosted(_ *plugin.Context, _ *model.Post) (*model
 	for _, isMaster := range []bool{true, false} {
 		// We replace the master DB with master and replica both just to make
 		// gorp APIs work.
-		store.GetMaster().Db = sql.OpenDB(driver.NewConnector(p.Driver, isMaster))
+		handle := sql.OpenDB(driver.NewConnector(p.Driver, isMaster))
+		store.GetMaster().Db = handle
+		store.SetMasterX(handle)
 
 		// Testing with a handful of stores
 		storetest.TestPostStore(p.t, store, store)