Simplify history page & date-times across the app

[taylordowns2000]

For @stuartc when he gets here: https://openfn.slack.com/archives/C0593EZ8K8E/p1751302572003819

Closes #1255 by standardizing timestamps and making ISO timestamps copyable
Closes #1419 by providing a click to copy for dataclip body

Validation steps

check for relative and detailed, detailed should have proper timezone via UTC+/- offset but both should show UTC in ISO format

1. http://localhost:4000/projects - check "Last updated"
2. inspector - run view - check "Started" and "Finsihed"
3. history - check "Received at", "Last Activity", and "enqueue at..." timestamps
4. history - sort by "created" and by "last run finished"
5. history - click on dataclip ID and view dataclip
6. history - click on row and see expansion
7. run detail - check "Started" and "Finished"
8. http://localhost:4000/profile - check "Created"
9. http://localhost:4000/profile/tokens - check "Created on"
10. ...

AI Usage

Please disclose how you've used AI in this work (it's cool, we just want to know!):

• Code generation (copilot but not intellisense)
• Learning or fact checking
• Strategy / design
• Optimisation / refactoring
• Translation / spellchecking / doc gen
• Other
• I have not used AI

You can read more details in our Responsible AI Policy

Pre-submission checklist

• I have performed a self-review of my code.
• I have implemented and tested all related authorization policies. (e.g., :owner, :admin, :editor, :viewer)
• I have updated the changelog.
• I have ticked a box in "AI usage" in this PR

[taylordowns2000]

@stuartc , if you're down with the direction of travel here (please click around and let me know) i'll clean up the tests and tweak a few lose ends with hovers and date formats.

[taylordowns2000]

thank you @stuartc . your part is done, un-assigning you now!