Alerting: Extend PUT rule-group route to write the entire rule group rather than top-level fields only (#53078)

* Wire up to full alert rule struct

* Extract group change detection logic to dedicated file

* GroupDiff -> GroupDelta for consistency

* Calculate deltas and handle backwards compatible requests

* Separate changes and insert/update/delete as needed

* Regenerate files

* Don't touch the DB if there are no changes

* Quota checking, delete unused file

* Mark modified records as provisioned

* Validation + a couple API layer tests

* Address linter errors

* Fix issue with UID assignment and rule creation

* Propagate top level group fields to all rules

* Tests for repeated updates and versioning

* Tests for quota and provenance checks

* Fix linter errors

* Regenerate

* Factor out some shared logic

* Drop unnecessary multiple nilchecks

* Use alternative strategy for rolling UIDs on inserted rules

* Fix tests, add back nilcheck, refresh UIDs during test

* Address feedback

* Add missing nil-check

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

@@ -3513,7 +3513,6 @@
    "$ref": "#/definitions/Duration"
   },
   "gettableAlert": {
-   "description": "GettableAlert gettable alert",
    "properties": {
     "annotations": {
      "$ref": "#/definitions/labelSet"
@@ -3569,7 +3568,6 @@
    "type": "object"
   },
   "gettableAlerts": {
-   "description": "GettableAlerts gettable alerts",
    "items": {
     "$ref": "#/definitions/gettableAlert"
    },
@@ -3735,7 +3733,6 @@
    "type": "array"
   },
   "postableSilence": {
-   "description": "PostableSilence postable silence",
    "properties": {
     "comment": {
      "description": "comment",
@@ -4183,15 +4180,15 @@
       "in": "body",
       "name": "Body",
       "schema": {
-       "$ref": "#/definitions/AlertRuleGroupMetadata"
+       "$ref": "#/definitions/AlertRuleGroup"
       }
      }
     ],
     "responses": {
      "200": {
-      "description": "AlertRuleGroupMetadata",
+      "description": "AlertRuleGroup",
       "schema": {
-       "$ref": "#/definitions/AlertRuleGroupMetadata"
+       "$ref": "#/definitions/AlertRuleGroup"
       }
      },
      "400": {