Specify the 202 Accepted response in RunService API

[barreiro]

attempt to fix #2098. I don't have a test for this right now.

this change causes the generated horreum-web/src/generated/apis/RunApi.ts file to change from:

return await response.value();

to

switch (response.raw.status) {
  case 200:
    return await response.value();
  case 202:
    return null;
  default:
    return await response.value();
}

this should prevent the Uncaught (in promise) SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data error, reported in the issue, that prevents the dialog from closing.

also added a catch call to be double safe.