Split migrations folder (#21549)

There are too many files in `models/migrations` folder so that I split
them into sub folders.

models/migrations/v1_10/v94.go

@@ -0,0 +1,24 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package v1_10 //nolint
+
+import "xorm.io/xorm"
+
+func AddStatusCheckColumnsForProtectedBranches(x *xorm.Engine) error {
+	type ProtectedBranch struct {
+		EnableStatusCheck   bool     `xorm:"NOT NULL DEFAULT false"`
+		StatusCheckContexts []string `xorm:"JSON TEXT"`
+	}
+
+	if err := x.Sync2(new(ProtectedBranch)); err != nil {
+		return err
+	}
+
+	_, err := x.Cols("enable_status_check", "status_check_contexts").Update(&ProtectedBranch{
+		EnableStatusCheck:   false,
+		StatusCheckContexts: []string{},
+	})
+	return err
+}