Filter out type generic for Classes with new DDC type system

[elliette]

For context: #2312

[annagrin]

We should fix the issues:

• Filter out type fields on objects: '$ti'

• Filter out variables in scope that we don't want to display:
  

  webdev/dwds/lib/src/debugging/dart_scope.dart

  Line 79 in 7543345

  return (type == 'function' && description.startsWith('class ')) ||

  • internal type representations (rti objects or, in old type system, Legacy type, Nullable types, Function types, abstract function type, Record types, etc)

• make sure showing used or unused type variables in closures matches VM experience (ether filter it out or convert to dart type)

• See

  webdev/fixtures/_testSound/example/scopes/main.dart

  Line 102 in 4d1de26

  return closureLocalInsideMethod; // Breakpoint: nestedClosure

Alternatively, consider moving the code for getting object properties and variables in scope to ddc debugger runtime API, splitting the runtime and chrome debugger API calls appropriately.