[tune] fix tune list-trials
metric
#18914
Merged
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Why are these changes needed?
Fetching result dataframes using metric and mode gives unexpected results and only works with rllib trainables.
Instead we should present the last observed results and not require any particular metric.
Related issue number
Follow-up to #18850
Closes #18740
Checks
scripts/format.sh
to lint the changes in this PR.