Rename Sync2 -> Sync (#26479)

The xorm `Sync2` has already been deprecated in favor of `Sync`,
so let's do the same inside the Gitea codebase.

Command used to replace everything:
```sh
for i in $(ag Sync2 --files-with-matches); do vim $i -c ':%sno/Sync2/Sync/g' -c ':wq'; done
```

models/migrations/v1_11/v103.go

@@ -13,5 +13,5 @@ func AddWhitelistDeployKeysToBranches(x *xorm.Engine) error {
 		WhitelistDeployKeys bool `xorm:"NOT NULL DEFAULT false"`
 	}
 
-	return x.Sync2(new(ProtectedBranch))
+	return x.Sync(new(ProtectedBranch))
 }

models/migrations/v1_11/v104.go

@@ -15,7 +15,7 @@ func RemoveLabelUneededCols(x *xorm.Engine) error {
 		QueryString string
 		IsSelected  bool
 	}
-	if err := x.Sync2(new(Label)); err != nil {
+	if err := x.Sync(new(Label)); err != nil {
 		return err
 	}
 

models/migrations/v1_11/v105.go

@@ -13,7 +13,7 @@ func AddTeamIncludesAllRepositories(x *xorm.Engine) error {
 		IncludesAllRepositories bool  `xorm:"NOT NULL DEFAULT false"`
 	}
 
-	if err := x.Sync2(new(Team)); err != nil {
+	if err := x.Sync(new(Team)); err != nil {
 		return err
 	}
 

models/migrations/v1_11/v106.go

@@ -17,7 +17,7 @@ type Watch struct {
 }
 
 func AddModeColumnToWatch(x *xorm.Engine) error {
-	if err := x.Sync2(new(Watch)); err != nil {
+	if err := x.Sync(new(Watch)); err != nil {
 		return err
 	}
 	_, err := x.Exec("UPDATE `watch` SET `mode` = 1")

models/migrations/v1_11/v107.go

@@ -13,5 +13,5 @@ func AddTemplateToRepo(x *xorm.Engine) error {
 		TemplateID int64 `xorm:"INDEX"`
 	}
 
-	return x.Sync2(new(Repository))
+	return x.Sync(new(Repository))
 }

models/migrations/v1_11/v108.go

@@ -13,5 +13,5 @@ func AddCommentIDOnNotification(x *xorm.Engine) error {
 		CommentID int64
 	}
 
-	return x.Sync2(new(Notification))
+	return x.Sync(new(Notification))
 }

models/migrations/v1_11/v109.go

@@ -12,5 +12,5 @@ func AddCanCreateOrgRepoColumnForTeam(x *xorm.Engine) error {
 		CanCreateOrgRepo bool `xorm:"NOT NULL DEFAULT false"`
 	}
 
-	return x.Sync2(new(Team))
+	return x.Sync(new(Team))
 }

models/migrations/v1_11/v111.go

@@ -36,11 +36,11 @@ func AddBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 		IssueID    int64 `xorm:"index"`
 	}
 
-	if err := x.Sync2(new(ProtectedBranch)); err != nil {
+	if err := x.Sync(new(ProtectedBranch)); err != nil {
 		return err
 	}
 
-	if err := x.Sync2(new(Review)); err != nil {
+	if err := x.Sync(new(Review)); err != nil {
 		return err
 	}
 

models/migrations/v1_11/v113.go

@@ -15,8 +15,8 @@ func FeatureChangeTargetBranch(x *xorm.Engine) error {
 		NewRef string
 	}
 
-	if err := x.Sync2(new(Comment)); err != nil {
-		return fmt.Errorf("Sync2: %w", err)
+	if err := x.Sync(new(Comment)); err != nil {
+		return fmt.Errorf("Sync: %w", err)
 	}
 	return nil
 }

models/migrations/v1_11/v116.go

@@ -24,7 +24,7 @@ func ExtendTrackedTimes(x *xorm.Engine) error {
 		return err
 	}
 
-	if err := sess.Sync2(new(TrackedTime)); err != nil {
+	if err := sess.Sync(new(TrackedTime)); err != nil {
 		return err
 	}