[data][dashboard] Add time_to_first_batch and get_ref_bundles to data dashboard attempt 2#58912

TimothySeah wants to merge 2 commits intoray-project:masterray-project/ray:masterfrom

TimothySeah:tseah/try-dashboard-panel-againTimothySeah/ray:tseah/try-dashboard-panel-againCopy head branch name to clipboard