Provisioning: webhook last event timestamp (#103180)

* Record webhook pinged event

* Add TODO for webhook creation updated

* Hack to wire client

* Revert accidental change in controller

* Wire the client

* Use factory method

* Remove omit empty

* Regenerate client

* Fix compilation

* Every 30 seconds if not pinged

* Move lines around

* Use different approach

* Added as part of the controller

* Exponential backoff for waiting for ping

* More stuff

* Revert changes in controller

* Add separate webhook section in overview

* Change order of translations

* Update ping within 1 minute

* Last event update

* Extract translation

* Display last event in frontend

* Refactor the logic around update

* Fix the type to marshal

pkg/tests/apis/openapi_snapshots/provisioning.grafana.app-v0alpha1.json

@@ -3903,6 +3903,10 @@
             "type": "integer",
             "format": "int64"
           },
+          "lastEvent": {
+            "type": "integer",
+            "format": "int64"
+          },
           "secret": {
             "type": "string"
           },