Previews: datasource permissions (#52747)

* Previews: datasource permissions

* lint

* simplify - force non-null `ds_uids`

* add `canBeDisabled` to search service

* add `IncludeThumbnailsWithEmptyDsUids`

* remove force refresh migration

* refactor main preview service

* add safeguard

* revert ticker interval

* update testdata

* fix test

* add mock search service

* add datasources lookup test

* update migration

* extract ds lookup to its own package to avoid cyclic imports

* lint

* fix dashbaord extract, use the real datasource lookup in tests. IS IT BULLETPROOF YET?!

* fix dashbaord extract, use the real datasource lookup in tests. IS IT BULLETPROOF YET?!

* remove stale log

* consistent casing

* pass context to `createServiceAccount`

* filter out the special grafana ds

pkg/services/searchV2/extract/testdata/mixed-datasource-with-variable-info.json

@@ -6,14 +6,14 @@
     "dsVariable"
   ],
   "datasource": [
-    {
-      "uid": "gdev-testdata",
-      "type": "testdata"
-    },
     {
       "uid": "default.uid",
       "type": "default.type"
     },
+    {
+      "uid": "PD8C576611E62080A",
+      "type": "testdata"
+    },
     {
       "uid": "P8045C56BDA891CB2",
       "type": "cloudwatch"
@@ -26,14 +26,14 @@
       "type": "table",
       "pluginVersion": "9.1.0-pre",
       "datasource": [
-        {
-          "uid": "gdev-testdata",
-          "type": "testdata"
-        },
         {
           "uid": "default.uid",
           "type": "default.type"
         },
+        {
+          "uid": "PD8C576611E62080A",
+          "type": "testdata"
+        },
         {
           "uid": "P8045C56BDA891CB2",
           "type": "cloudwatch"