Switch ui tests to trybuild

test_suite/tests/ui/unknown-attribute/container.stderr

@@ -3,6 +3,3 @@ error: unknown serde container attribute `abc`
   |
 4 | #[serde(abc = "xyz")]
   |         ^^^
-
-error: aborting due to previous error
-

test_suite/tests/ui/unknown-attribute/field.stderr

@@ -3,6 +3,3 @@ error: unknown serde field attribute `abc`
   |
 5 |     #[serde(abc = "xyz")]
   |             ^^^
-
-error: aborting due to previous error
-

test_suite/tests/ui/unknown-attribute/variant.stderr

@@ -3,6 +3,3 @@ error: unknown serde variant attribute `abc`
   |
 5 |     #[serde(abc = "xyz")]
   |             ^^^
-
-error: aborting due to previous error
-