LIMS-2041: Remove date-fns and date-fns-tz

[ndg63276]

JIRA ticket: LIMS-2041

Summary:

The date-fns-tz library is installed but no longer used, and the date-fns library is only used in a few places to format dates, where native functions can work just as well.

Changes:

• Remove date-fns and date-fns-tz from package.json
• Remove the formatDate alias from the webpack config
• Replace uses of formatDate with native JS functions

To test:

• Find or create a puck suitable for UDC, eg /containers/cid/349303. Click the Queue button, check the date and time of queueing are displayed in local form, eg 15/01/2026, 16:58:21. (What is saved in the database is current_timestamp, so when you refresh the page you get the PHP version, eg 15-01-2026 16:58)
• Go to /dewars/registry, and add a new dewar using the form at the bottom, eg DLS-MX-5432. Check it appears in the top half with a Created timestamp in the same form as the other dewars, eg 2026-01-15 17:00:41 (again it is saved in the database as current_timestamp, so it may be slightly different after a refresh)
• Go to a visits stats page, eg /stats/visit/mx23694-152. Check the date range of the visit is shown at the top right of the page, near the visit breakdown, eg 08/12/2025 - 10/12/2025.
• Check the same for the beamline stats page eg /runs/overview/bl/i03 has 01/01/2026 - 13/03/2026