s/Get(Master|Replica)X/Get\1/g (#29520)

Drop the legacy `X` suffix from `GetMasterX` and `GetReplicaX`. The
presence of the suffix suggests there's a `non-X` version: but in fact
we migrated these away a long time ago, so remove the cognitive
overhead.

As an aside, this additionally helps avoid trip up LLMs that interpret
this as "something to fix".

server/config/main_test.go

@@ -36,7 +36,7 @@ func truncateTable(t *testing.T, table string) {
 
 	switch *sqlSetting.DriverName {
 	case model.DatabaseDriverMysql:
-		_, err := sqlStore.GetMasterX().Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
+		_, err := sqlStore.GetMaster().Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
 		if err != nil {
 			if driverErr, ok := err.(*mysql.MySQLError); ok {
 				// Ignore if the Configurations table does not exist.
@@ -48,7 +48,7 @@ func truncateTable(t *testing.T, table string) {
 		require.NoError(t, err)
 
 	case model.DatabaseDriverPostgres:
-		_, err := sqlStore.GetMasterX().Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
+		_, err := sqlStore.GetMaster().Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
 		if err != nil {
 			if driverErr, ok := err.(*pq.Error); ok {
 				// Ignore if the Configurations table does not exist.