Revert "Alerting: Add is_paused attr to the POST alert rule group endpoint" (#62310)

Revert "Alerting: Add is_paused attr to the POST alert rule group endpoint (#62253)"

This reverts commit 3ccafe3a5a.

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

@@ -4501,9 +4501,6 @@
             "Error"
           ]
         },
-        "is_paused": {
-          "type": "boolean"
-        },
         "no_data_state": {
           "type": "string",
           "enum": [
@@ -5890,6 +5887,7 @@
       "$ref": "#/definitions/alertGroup"
     },
     "alertGroups": {
+      "description": "AlertGroups alert groups",
       "type": "array",
       "items": {
         "$ref": "#/definitions/alertGroup"
@@ -5995,6 +5993,7 @@
       }
     },
     "gettableAlert": {
+      "description": "GettableAlert gettable alert",
       "type": "object",
       "required": [
         "labels",
@@ -6051,7 +6050,6 @@
       "$ref": "#/definitions/gettableAlert"
     },
     "gettableAlerts": {
-      "description": "GettableAlerts gettable alerts",
       "type": "array",
       "items": {
         "$ref": "#/definitions/gettableAlert"
@@ -6059,7 +6057,6 @@
       "$ref": "#/definitions/gettableAlerts"
     },
     "gettableSilence": {
-      "description": "GettableSilence gettable silence",
       "type": "object",
       "required": [
         "comment",
@@ -6109,7 +6106,6 @@
       "$ref": "#/definitions/gettableSilence"
     },
     "gettableSilences": {
-      "description": "GettableSilences gettable silences",
       "type": "array",
       "items": {
         "$ref": "#/definitions/gettableSilence"
@@ -6300,6 +6296,7 @@
       "$ref": "#/definitions/postableSilence"
     },
     "receiver": {
+      "description": "Receiver receiver",
       "type": "object",
       "required": [
         "active",