refactor: restructure list/map compilation loops and extract syntax error tests

- Convert list() and map() compiler functions from if/do-while to do-while loops
- Remove redundant empty literal handling by breaking on right bracket/brace
- Add new test files for duplicate comma, duplicate trailing comma, and empty list/map with comma
- Expand newlines test to cover trailing comma and empty list/map cases
- Simplify trailing_comma tests by removing inline syntax error checks
- Update Test.fail() to handle variable arguments without kwargs

test/language/list/newlines.wren

@@ -8,3 +8,17 @@ var list = [
 
 IO.print(list[0]) // expect: a
 IO.print(list[1]) // expect: b
+
+// Newline after trailing comma.
+list = ["c",
+
+]
+
+IO.print(list[0]) // expect: c
+
+// Newline in empty list.
+list = [
+
+]
+
+IO.print(list.count) // expect: 0