Pull out date change code

[lmd59]

Summary

Remove functionality that allows the user to change the date format on review comments.

New behavior

Review comment date is not clickable and stays in the same format. This feature does not seem to have a lot of utility. Removing it fixes an issue with date displays where a review comment card may show the date of another review comment rather than its own. To reproduce this issue on the main branch:

• Add multiple review comments with dates to a draft artifact, taking note of their correct timestamps
• Add a review comment on the add tab
• Immediately switch over to the view tab
• Some review comments will have incorrect timestamps
• Timestamps are fixed with reload

Code changes

Remove hover, color change, click response, and date formatter, replaced with simple date display.

Testing guidance

• 'npm run check:all`
• Run with npm run start:all
• Create a draft artifact if necessary
• Select review option for draft artifact
• Try to reproduce issue described above (issue should be fixed, and accurate timestamps should be simply displayed)

[elsaperelli]

Agreed that we no longer need this functionality. Lgtm!