Update duration formatting to use Intl.DurationFormat

[lewisbirks]

Closes #840

Migrate from custom duration formatting messages to those provided by Intl.DurationFormat.

I have tried to keep the consistency in number of digits displayed the same as it was before but if we want this can be altered further.

By using this formatter, it does make the durations generated in the frontend inconsistent with those generated in the backend, see the run detail cards.

I've updated us to node 24 as part of this as the functionality was only introduced in node 23. I have added a polyfill for users that are not on the latest version of their browsers as I expect that it will error out if it runs into that scenario (this shouldn't impact most users, maybe just firefox).

I've had to disable TS checking on the formatter construction as TS does not yet support it.

Testing done

Manual testing with Bulgarian

English for comparison

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