Fatal Error: Undefined constant Google\\Cloud\\PubSub\\PubSubClient::SERVICE_NAME

[mrVrAlex]

Hello!
It seems missing constant for PubSubClient:

Here in costruct have calling trait method ClientOptionsTrait::buildClientOptions from Google/ApiCore:
https://github.com/googleapis/google-cloud-php-pubsub/blob/main/src/PubSubClient.php#L191
And there have calling method ClientOptionsTrait::logConfiguration
https://github.com/googleapis/gax-php/blob/main/src/ClientOptionsTrait.php#L147
where access to constant in current client:
https://github.com/googleapis/gax-php/blob/main/src/ClientOptionsTrait.php#L374

Code example

putenv('GOOGLE_SDK_PHP_LOGGING=true');
$pubSub = new PubSubClient();
$topic = $pubSub->topic('my_topic');
$topic->publish([
    'data' => 'My new message.',
    'attributes' => [
        'location' => 'Detroit'
    ]
]);

Environment details

• OS: Any
• PHP version: Any
• Package name and version: Latest