* Introduce PluginRequestValidator abstraction with a NoOp implementation
* Update PluginRequestValidator abstraction to use the dsURL instead
* Inject PluginRequestValidator into the HTTPServer and validate requests going through data source proxy
* Inject PluginRequestValidator into the BackendPluginManager and validate requests going through it
* Validate requests going through QueryMetrics & QueryMetricsV2
* Validate BackendPluginManager health requests
* Fix backend plugins manager tests
* Validate requests going through alerting service
* Fix tests
* fix tests
* goimports
Co-authored-by: Leonard Gram <leo@xlson.com>
This way we are able to edit notification behavior per notifier.
This would be usefull to let some notifiers send notifications,
even when the state doesn't change, or with custom condition.
Signed-off-by: Thibault Chataigner <t.chataigner@criteo.com>