This duplicate issue was created because openshift/console github bots require a valid CONSOLE Jira to be associated with all PRs. 

Description

Migrate Developer View > Observe > Silences Tab code from openshift/console to openshift/monitoring-plugin. This is part of the ongoing effort to consolidate code between the Administrative and Developer Views of the Observe section. 

Related Jira Issue 

https://issues.redhat.com/browse/OU-257

Related PRs 

• PR to remove Developer View > Observe > Silence Tab from openshift/console
  • https://github.com/openshift/console/pull/14480
• PR to add Developer View > Observe > Silence Tab to openshift/monitoring-plugin
  • https://github.com/openshift/monitoring-plugin/pull/252