fix(sdk): json to struct error message missing dash (#3924)

Formatting was off for first error messages when failing to convert Json to Struct
This is what it looked like
<img width="620" alt="image" src="https://github.com/winglang/wing/assets/45375125/398f355e-7b95-4bef-8639-2ecac755be09">
Notice the first error was missing the `-` now it looks better
<img width="601" alt="image" src="https://github.com/winglang/wing/assets/45375125/04425042-bb5c-40ad-bf06-e4a211ee7697">

## Checklist

- [x] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [x] Description explains motivation and solution
- [x] Tests added (always)
- [x] Docs updated (only required for features)
- [x] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Wing Cloud Contribution License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

libs/wingsdk/src/std/struct.ts

@@ -51,7 +51,7 @@ export class Struct {
     const result = validator.validate(obj, schema);
     if (result.errors.length > 0) {
       throw new Error(
-        `unable to parse ${schema.id.replace("/", "")}:\n ${result.errors.join(
+        `unable to parse ${schema.id.replace("/", "")}:\n- ${result.errors.join(
           "\n- "
         )}`
       );

tools/hangar/__snapshots__/error.ts.snap

@@ -116,7 +116,7 @@ Duration <DURATION>"
 
 exports[`struct_from_json_1.w 1`] = `
 "ERROR: unable to parse Person:
- instance.age is not of a type(s) number
+- instance.age is not of a type(s) number
 
 ../../../examples/tests/error/target/test/struct_from_json_1.wsim.[REDACTED].tmp/.wing/preflight.js:9
        const Person = require(\\"./Person.Struct.js\\")($stdlib.std.Struct, $stdlib.core.NodeJsCode.fromInline);
@@ -134,7 +134,7 @@ Duration <DURATION>"
 
 exports[`struct_from_json_2.w 1`] = `
 "ERROR: unable to parse Student:
- instance.age is not of a type(s) number
+- instance.age is not of a type(s) number
 - instance requires property \\"advisor\\"
 
 ../../../examples/tests/error/target/test/struct_from_json_2.wsim.[REDACTED].tmp/.wing/preflight.js:11
@@ -153,7 +153,7 @@ Duration <DURATION>"
 
 exports[`struct_from_json_3.w 1`] = `
 "ERROR: unable to parse Student:
- instance.age is not of a type(s) number
+- instance.age is not of a type(s) number
 - instance.advisors[1].id is not of a type(s) string
 
 ../../../examples/tests/error/target/test/struct_from_json_3.wsim.[REDACTED].tmp/.wing/preflight.js:11
@@ -172,7 +172,7 @@ Duration <DURATION>"
 
 exports[`struct_from_json_4.w 1`] = `
 "ERROR: unable to parse Student:
- instance.advisors contains duplicate item
+- instance.advisors contains duplicate item
 
 ../../../examples/tests/error/target/test/struct_from_json_4.wsim.[REDACTED].tmp/.wing/preflight.js:11
        const Student = require(\\"./Student.Struct.js\\")($stdlib.std.Struct, $stdlib.core.NodeJsCode.fromInline);
@@ -190,7 +190,7 @@ Duration <DURATION>"
 
 exports[`struct_from_json_5.w 1`] = `
 "ERROR: unable to parse Foo:
- instance.names.c is not of a type(s) string
+- instance.names.c is not of a type(s) string
 
 ../../../examples/tests/error/target/test/struct_from_json_5.wsim.[REDACTED].tmp/.wing/preflight.js:9
        const Foo = require(\\"./Foo.Struct.js\\")($stdlib.std.Struct, $stdlib.core.NodeJsCode.fromInline);