[UI Feature] Show notification if metrics are not available

[andreyvelich]

/kind feature

See comment: #1245 (comment).
In some cases Trials can be succeeded without reporting metrics.

We should show that metrics are unavailable in Trials information table.
If objective metrics were not reported from all Trials, user should see appropriate message.

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[andreyvelich]

/priority p2

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[andreyvelich]

/lifecycle frozen