migrate: refactor examples to use the new FromFS function

migrate/example/cql/embed.go

@@ -0,0 +1,13 @@
+// Copyright (C) 2017 ScyllaDB
+// Use of this source code is governed by a ALv2-style
+// license that can be found in the LICENSE file.
+
+// +build all integration
+
+package cql
+
+import "embed"
+
+// Files contains *.cql schema migration files.
+//go:embed *.cql
+var Files embed.FS

migrate/example/cql/m1.cql

@@ -0,0 +1,15 @@
+-- Comment
+
+CREATE TABLE bar ( id int PRIMARY KEY);
+
+INSERT INTO bar (id) VALUES (1);
+
+-- CALL 1;
+
+INSERT INTO bar (id) VALUES (2);
+
+-- CALL 2;
+
+INSERT INTO bar (id) VALUES (3);
+
+-- CALL 3;