Dashboard: Remove super old prop that has not been used in years (#50826)

docs/sources/developers/http_api/dashboard.md

@@ -406,7 +406,6 @@ Content-Type: application/json
 {
   "dashboard": {
     "editable":false,
-    "hideControls":true,
     "nav":[
       {
         "enable":false,

docs/sources/developers/http_api/dashboard_versions.md

@@ -177,7 +177,6 @@ Content-Length: 1300
     "editable": true,
     "gnetId": null,
     "graphTooltip": 0,
-    "hideControls": false,
     "id": 1,
     "links": [
 
@@ -290,7 +289,6 @@ Content-Length: 1300
     "editable": true,
     "gnetId": null,
     "graphTooltip": 0,
-    "hideControls": false,
     "id": 1,
     "links": [
 

docs/sources/developers/http_api/snapshot.md

@@ -29,7 +29,6 @@ title: 'HTTP Snapshot API '
     {
       "dashboard": {
         "editable":false,
-        "hideControls":true,
         "nav":[
         {
           "enable":false,
@@ -157,7 +156,6 @@ Content-Type: application/json
   },
   "dashboard": {
     "editable":false,
-    "hideControls":true,
     "nav": [
       {
         "enable":false,