fix(ui): humanize timestamps on ML entities UI

[yoonhyejin]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[codecov]

Codecov Report

Attention: Patch coverage is 54.65116% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ub-web-react/src/app/sharedV2/TimestampPopover.tsx	63.49%	23 Missing ⚠️
...p/entity/mlModelGroup/profile/ModelGroupModels.tsx	28.57%	5 Missing ⚠️
.../src/app/entity/mlModel/profile/MLModelSummary.tsx	25.00%	3 Missing ⚠️
...rc/app/entityV2/mlModel/profile/MLModelSummary.tsx	25.00%	3 Missing ⚠️
...entityV2/mlModelGroup/profile/ModelGroupModels.tsx	25.00%	3 Missing ⚠️
...essInstance/profile/DataProcessInstanceSummary.tsx	50.00%	2 Missing ⚠️

❌ Your patch check has failed because the patch coverage (54.65%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

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