Alerting: Consume k8s API for notification policies tree (#96147)

* Add basic usage of K8s API for notification policies

* Add permissions checks for navtree for routes

* Add and update permissions for routing tree logic

* Add capability to skip calling contact points hook

* Conditionally show list of mute timings depending on permissions

* Conditionally link to mute timings if user can see at least one

* Add work in progress k8s handlers for routing tree

* Update notification policy hooks

* Wire up policies to permissions better (conditionally calling APIs)

* Add additional checks for whether to show grafana AM

* Add permission checks to access control

* Remove accidental permissions after rebase

* Update types and const for k8s routes

* Improve statefulness and reset routing tree in tests

* Update notif policy tests to check k8s and config API

* Fix type assertion

* Move non-grafana test out of .each

* Make failure case safer

* Override tag invalidation for notification policies API

* Pass in error and add new error alert component

* Add basic mock server conflict check

* Add test to check user can save after a conflict

* Add logic to allow reloading policies if changed by another user

* Fix test

* Update translations in Modals

* Add ViewAlertGroups ability

* Tweak provisioning logic and memoize AM config response

* Update snapshots for useAbilities

* Update result destructure

* Use enums for provenance in routingtrees

* Use consistent memoisation

* Fix _metadata for vanilla AM

* useAsync for error / update state

* move k8s api error handling to separate file

* use cause for error codes

* Use `supported` bools from Alertmanager abilities and clarify default policy

---------

Co-authored-by: Konrad Lalik <konrad.lalik@grafana.com>
Co-authored-by: Gilles De Mey <gilles.de.mey@gmail.com>

pkg/services/navtree/navtreeimpl/navtree.go

@@ -452,6 +452,8 @@ func (s *ServiceImpl) buildAlertNavLinks(c *contextmodel.ReqContext) *navtree.Na
 	if hasAccess(ac.EvalAny(
 		ac.EvalPermission(ac.ActionAlertingNotificationsRead),
 		ac.EvalPermission(ac.ActionAlertingNotificationsExternalRead),
+		ac.EvalPermission(ac.ActionAlertingRoutesRead),
+		ac.EvalPermission(ac.ActionAlertingRoutesWrite),
 		ac.EvalPermission(ac.ActionAlertingNotificationsTimeIntervalsRead),
 		ac.EvalPermission(ac.ActionAlertingNotificationsTimeIntervalsWrite),
 	)) {