Alerting: Fix integration test for creating silences (#65722)
* fix integration test for creating silences
to create correct silence with endsAt in the future
* Update api_alertmanager_test.go
(cherry picked from commit ed8628e39d)
Co-authored-by: Yuri Tseretyan <yuriy.tseretyan@grafana.com>
Integration tests
This directory contains Grafana server integration tests.