feat: double default truncateAt for guzzle error output

[bshaffer]

Guzzle 7 Only

This will help the user receive a more helpful error message when encountering Google API exceptions. For example, with the "reAuth" error:

Before

Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: `POST https://oauth2.googleapis.com/token` resulted in a `400 Bad Request` response:
{
  "error": "invalid_grant",
  "error_description": "reauth related error (rapt_required)",
  "error_uri": "https://sup (truncated...)
 in /path/to/project/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113

After

Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: `POST https://oauth2.googleapis.com/token` resulted in a `400 Bad Request` response:
{
  "error": "invalid_grant",
  "error_description": "reauth related error (rapt_required)",
  "error_uri": "https://support.google.com/a/answer/9368756",
  "error_subtype": "rapt_required"
}
 in /path/to/project/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113

[TimurSadykov]

LGTM, thanks for a quick fix!

[noahdietz]

Should this be made configurable somehow? Is there already a way to configure things in this package?

[bshaffer]

It's possible for the end user to pass in custom guzzle clients like this:

$http = new GuzzleHttp\Client($someCustomConfig);
$assetClient = new AssetServiceGapicClient([
    'credentialsConfig' => [
        'authHttpHandler' => $http, // for calls made to the token endpoint
    ],
    'rest' => [
        'httpHandler' => $http,     // for calls made to the API using REST
    ]
]);

However, this change is to modify the default value, so we're just hardcoding it.