Reduce usage of db.DefaultContext (#27073)

Part of #27065

This reduces the usage of `db.DefaultContext`. I think I've got enough
files for the first PR. When this is merged, I will continue working on
this.

Considering how many files this PR affect, I hope it won't take to long
to merge, so I don't end up in the merge conflict hell.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/org/member.go

@@ -31,7 +31,7 @@ func listMembers(ctx *context.APIContext, publicOnly bool) {
 		return
 	}
 
-	members, _, err := organization.FindOrgMembers(opts)
+	members, _, err := organization.FindOrgMembers(ctx, opts)
 	if err != nil {
 		ctx.InternalServerError(err)
 		return