chore(db): introduce db.Session and db.EngineMigration interfaces (#37746)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/migrations/v1_6/v70.go

@@ -7,12 +7,11 @@ import (
 	"fmt"
 	"time"
 
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/setting"
-
-	"xorm.io/xorm"
 )
 
-func AddIssueDependencies(x *xorm.Engine) (err error) {
+func AddIssueDependencies(x db.EngineMigration) (err error) {
 	type IssueDependency struct {
 		ID           int64     `xorm:"pk autoincr"`
 		UserID       int64     `xorm:"NOT NULL"`

models/migrations/v1_6/v71.go

@@ -6,14 +6,13 @@ package v1_6
 import (
 	"fmt"
 
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/migrations/base"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
-
-	"xorm.io/xorm"
 )
 
-func AddScratchHash(x *xorm.Engine) error {
+func AddScratchHash(x db.EngineMigration) error {
 	// TwoFactor see models/twofactor.go
 	type TwoFactor struct {
 		ID               int64 `xorm:"pk autoincr"`

models/migrations/v1_6/v72.go

@@ -6,12 +6,11 @@ package v1_6
 import (
 	"fmt"
 
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/timeutil"
-
-	"xorm.io/xorm"
 )
 
-func AddReview(x *xorm.Engine) error {
+func AddReview(x db.EngineMigration) error {
 	// Review see models/review.go
 	type Review struct {
 		ID          int64 `xorm:"pk autoincr"`