Handle timeouts in `Pushgateway.push()` properly

[nforro]

In case the pushgateway pod gets stuck, push_to_gateway() in all workers will raise unhandled TimeoutError. Fix that.

packit-service/packit_service/worker/monitoring.py

Lines 168 to 172 in 1b94583

	push_to_gateway(
	self.pushgateway_address,
	job=self.worker_name,
	registry=self.registry,
	)

Sentry issue: https://red-hat-it.sentry.io/issues/7081901299