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/trailing_comma.wren

@@ -1,12 +1,4 @@
-var list = [
-  "a",
-  "b",
-]
+var list = ["a", "b",]
 
 IO.print(list[0]) // expect: a
 IO.print(list[1]) // expect: b
-
-// Invalid syntax
-IO.print(new Fiber { Meta.eval("[,]")    }.try()) // expect: Could not compile source code.
-IO.print(new Fiber { Meta.eval("[1,,]")  }.try()) // expect: Could not compile source code.
-IO.print(new Fiber { Meta.eval("[1,,2]") }.try()) // expect: Could not compile source code.