add `formatRelativeDate` to replace date with string

[mateoclarke]

Associated issues

Closes https://github.com/cityofaustin/atd-data-tech/issues/18671

Testing

URL to test: https://deploy-preview-1407--atd-moped-main.netlify.app/moped/projects/1822?tab=funding

Steps to test:

• Go to URL above which is a test project's funding tab.
• Scroll down to the "Work activities" table.
• Scroll right in the table window to the "Updated at" column.
• The date should appear as a relative time string (ex: "Just now" or "1 day ago").
• Test this by clicking the "ADD WORK ACTIVITY" button on this or other projects.

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Ship list

• [x] Code reviewed
• [x] Product manager approved
• [ ] Product manager checked DB view dependencies
• [ ] Product manager added to QA test script if applicable

[mddilley]

@roseeichelmann great question - i see in the code that the date format kicks in after 30 days which scores another point for showing them both to me.

[mateoclarke]

@mddilley your requested changes have been implemented.

[mddilley]

Forgot to mention that I tested sorting this column too, and it worked as expected. 🚀