Update Checkpoint Harmony Endpoint dashboard images with light and da… (DataDog#22163)

* Update Checkpoint Harmony Endpoint dashboard images with light and dark themes

* Update dashboard screenshots with improved data

* Update dashboard screenshots

* Update dashboard screenshots

Author: mahipdeora25

checkpoint_harmony_endpoint/images/checkpoint_harmony_endpoint_overview.png

@@ -14,8 +14,13 @@
     "media": [
       {
         "media_type": "image",
-        "caption": "Checkpoint Harmony Endpoint Overview",
-        "image_url": "images/checkpoint_harmony_endpoint_overview.png"
+        "caption": "Checkpoint Harmony Endpoint Overview (Light)",
+        "image_url": "images/checkpoint_harmony_endpoint_overview_light.png"
+      },
+      {
+        "media_type": "image",
+        "caption": "Checkpoint Harmony Endpoint Overview (Dark)",
+        "image_url": "images/checkpoint_harmony_endpoint_overview_dark.png"
       }
     ],
     "classifier_tags": [