Migrate Calculations to DX

[toropok]

Description of the issue/feature this PR addresses

This PR migrates the AT Calculation to Dexterity for Python 3 compatibility.

Current behavior before PR

Calculation is a content type based on the Archetypes framework

Desired behavior after PR is merged

Calculation is a content type based on the Dexterity framework

--
I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.

[toropok]

Hi @ramonski @xispa,

Here's my preliminary delivery for the calc migration! 😊 This migration turned out to be quite a tough nut compared to the previous ones—no chance it would’ve worked without the invaluable help of @Bugerman58! 🚀

Currently, we’re stuck at a point where the tests are failing. Specifically:

We’re not using HistoryAwareReferenceField as expected.
Was there any thought about using an alternative?
Or is there no longer a need to maintain version references?
Looking forward to your input!

[ramonski]

Hi Leonid, hi Anton,
many thanks for your continuous efforts and support that we really appreciate!
Yes, indeed, you picked a tough nut with the calculations 🤯
Regarding the HistoryAwareReferenceWidget, Jordi and I discussed once that we want to drop it and maybe lookup the values from the Snapshot storage? And even combine this with our UIDReferenceField?
Anyhow, we'll find a solution for this for sure.
Thanks again for your good work and we'll review as soon as possible!

[xispa]

Excellent work @toropok and @Bugerman58 🥇 . I can imagine how challenging the migration of Calculation has been!. Your amazing work is really appreciated! Willing to review the Pull Request already and maybe we open another one later for the removal of the HistoryAware relic!

[xispa]

Hi @toropok , tests are failing https://github.com/senaite/senaite.core/actions/runs/11948903328/job/33307294669

Can you please take a look before I start to review?

[toropok]

Hi @toropok , tests are failing https://github.com/senaite/senaite.core/actions/runs/11948903328/job/33307294669

Can you please take a look before I start to review?

Hi @xispa

Sure, I'll fix the failed Python tests (they only test object validation) and get back to you. The remaining failing tests are doctests, which are related to HistoryAwareReferenceField.