Alerting: Allow filtering of contact points by name (#51933)

* Define query param and regenerate

* Add query struct for contact points

* Filter contact points by name in query

* Document that name filter is optional

pkg/services/ngalert/api/tooling/api.json

@@ -3386,6 +3386,14 @@
   "/api/v1/provisioning/contact-points": {
    "get": {
     "operationId": "RouteGetContactpoints",
+    "parameters": [
+     {
+      "description": "Filter by name",
+      "in": "query",
+      "name": "name",
+      "type": "string"
+     }
+    ],
     "responses": {
      "200": {
       "description": "ContactPoints",