Revert "[data][dashboard] Add time_to_first_batch and get_ref_bundles… (ray-project#58911)

This reverts commit 3663299.

````

[2025-11-22T01:29:32Z]   File "/rayci/python/ray/dashboard/modules/metrics/dashboards/data_dashboard_panels.py", line 1451, in <module>
--
[2025-11-22T01:29:32Z]     assert len(all_panel_ids) == len(
[2025-11-22T01:29:32Z] AssertionError: Duplicated id found. Use unique id for each panel. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 43, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 70, 71, 72, 73, 74, 75, 76, 77, 78, 78, 79, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108]


````

Co-authored-by: Lonnie Liu <[email protected]>

Author: rayci-bot

python/ray/dashboard/modules/metrics/dashboards/data_dashboard_panels.py

@@ -1050,36 +1050,6 @@
     stack=False,
 )
 
-ITERATION_TIME_TO_FIRST_BATCH_PANEL = Panel(
-    id=78,
-    title="Iteration Time to First Batch",
-    description="Seconds spent waiting for the first batch after starting iteration",
-    unit="seconds",
-    targets=[
-        Target(
-            expr="sum(ray_data_iter_time_to_first_batch_seconds{{{global_filters}}}) by (dataset)",
-            legend="Seconds: {{dataset}}",
-        )
-    ],
-    fill=0,
-    stack=False,
-)
-
-ITERATION_GET_REF_BUNDLES_PANEL = Panel(
-    id=79,
-    title="Iteration Get Ref Bundles Time",
-    description="Seconds spent getting RefBundles from the dataset iterator",
-    unit="seconds",
-    targets=[
-        Target(
-            expr="sum(ray_data_iter_get_ref_bundles_seconds{{{global_filters}}}) by (dataset)",
-            legend="Seconds: {{dataset}}",
-        )
-    ],
-    fill=0,
-    stack=False,
-)
-
 # Ray Data Metrics (Miscellaneous)
 SCHEDULING_LOOP_DURATION_PANEL = Panel(
     id=47,
@@ -1420,8 +1390,6 @@
             ITERATION_BLOCKS_LOCAL_PANEL,
             ITERATION_BLOCKS_REMOTE_PANEL,
             ITERATION_BLOCKS_UNKNOWN_LOCATION_PANEL,
-            ITERATION_TIME_TO_FIRST_BATCH_PANEL,
-            ITERATION_GET_REF_BUNDLES_PANEL,
         ],
         collapsed=True,
     ),