[v11.0.x] MySQL: snapshot tests (#86184)

MySQL: snapshot tests (#84846)

mysql: add snapshot tests
(cherry picked from commit 3b7ee3a56b)

Co-authored-by: Gábor Farkas <gabor.farkas@gmail.com>

pkg/tsdb/mysql/testdata/table/no_rows.golden.jsonc

@@ -0,0 +1,36 @@
+//  🌟 This was machine generated.  Do not edit. 🌟
+//  
+//  Frame[0] {
+//      "typeVersion": [
+//          0,
+//          0
+//      ],
+//      "executedQueryString": "SELECT * FROM tbl WHERE false"
+//  }
+//  Name: 
+//  Dimensions: 0 Fields by 0 Rows
+//  +
+//  +
+//  
+//  
+//  🌟 This was machine generated.  Do not edit. 🌟
+{
+  "status": 200,
+  "frames": [
+    {
+      "schema": {
+        "meta": {
+          "typeVersion": [
+            0,
+            0
+          ],
+          "executedQueryString": "SELECT * FROM tbl WHERE false"
+        },
+        "fields": []
+      },
+      "data": {
+        "values": []
+      }
+    }
+  ]
+}