Revert "Ui tests with compile_error resolved at call site"

This reverts commit e77db40b8d.

test_suite/tests/ui/with-variant/skip_ser_struct_field.stderr

@@ -1,9 +1,6 @@
 error: variant `Struct` cannot have both #[serde(serialize_with)] and a field `f1` marked with #[serde(skip_serializing)]
   --> tests/ui/with-variant/skip_ser_struct_field.rs:5:5
    |
-3  |   #[derive(Serialize)]
-   |            --------- in this derive macro expansion
-4  |   enum Enum {
 5  | /     #[serde(serialize_with = "serialize_some_other_variant")]
 6  | |     Struct {
 7  | |         #[serde(skip_serializing)]
@@ -11,5 +8,3 @@ error: variant `Struct` cannot have both #[serde(serialize_with)] and a field `f
 9  | |         f2: u8,
 10 | |     },
    | |_____^
-   |
-   = note: this error originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info)