Configure sentry logging integration for ERROR logs only (#559)

Setting this to WARNING causes to many extraneous logs to be reported
as issues in Sentry. `rio_tiler` in particular is very noisy, and it's
difficult to calibrate things because we have no control over the source
data its processing.

rdwatch/core/apps.py

@@ -40,7 +40,7 @@ def ready(self) -> None:
                 environment=settings.SENTRY_ENVIRONMENT,
                 release=settings.SENTRY_RELEASE,
                 integrations=[
-                    LoggingIntegration(level=logging.INFO, event_level=logging.WARNING),
+                    LoggingIntegration(level=logging.INFO, event_level=logging.ERROR),
                     DjangoIntegration(),
                     CeleryIntegration(),
                 ],