Enable distributed tracing in Sentry

See https://docs.sentry.io/platforms/python/tracing/.

Addresses emfollow/gwcelery#531 (comment 1287528).

gwcelery/sentry/__init__.py

@@ -63,6 +63,7 @@ def configure():
     version = 'gwcelery-{}'.format(_version.get_versions()['version'])
     environment = app.conf['sentry_environment']
     sentry_sdk.init(dsn, environment=environment, release=version,
+                    traces_sample_rate=1.0,
                     integrations=[celery.CeleryIntegration(),
                                   condor.CondorIntegration(),
                                   flask.FlaskIntegration(),

gwcelery/tests/test_sentry.py

@@ -48,6 +48,7 @@ def test_sentry_configure(mock_tornado_integration, mock_redis_integration,
     mock_celery_integration.assert_called_once_with()
     mock_sdk_init.assert_called_once_with(
         dsn, environment=environment, release=release,
+        traces_sample_rate=1.0,
         integrations=[
             mock_celery_integration.return_value,
             mock_condor_integration.return_value,