Use ctx instead of db.DefaultContext in some packages(routers/services/modules) (#19163)

* Remove `db.DefaultContext` usage in routers, use `ctx` directly

* Use `ctx` directly if there is one, remove some `db.DefaultContext` in `services`

* Use ctx instead of db.DefaultContext for `cmd` and some `modules` packages

* fix incorrect context usage

routers/web/repo/issue.go

@@ -1944,7 +1944,7 @@ func UpdatePullReviewRequest(ctx *context.Context) {
 		}
 		if reviewID < 0 {
 			// negative reviewIDs represent team requests
-			if err := issue.Repo.GetOwner(db.DefaultContext); err != nil {
+			if err := issue.Repo.GetOwner(ctx); err != nil {
 				ctx.ServerError("issue.Repo.GetOwner", err)
 				return
 			}