[#4418] Add addressNl specific mappings to Objects API registration (variables tab)

[vaszig]

Closes #4418

Changes

This PR handles the frontend part of the task

• Added specific addressNL fields/mappings to the Objects API registration (backend-frontend)
• Added stories

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [x] Checked copying a form
  • [x] Checked import/export of a form
  • [x] Config checks in the configuration overview admin page
  • [x] Problem detection in the admin email digest is handled

• Release management

  • [x] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [x] Commit messages refer to the relevant Github issue
  • [x] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.61905% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.60%. Comparing base (d985471) to head (8371e62). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ons/contrib/objects_api/submission_registration.py	94.44%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4751 +/- ## ======================================= Coverage 96.60% 96.60% ======================================= Files 749 749 Lines 25540 25575 +35 Branches 3377 3384 +7 ======================================= + Hits 24674 24708 +34 Misses 604 604 - Partials 262 263 +1 ```

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[vaszig]

FYI, we have to take into consideration the old forms that they already may have addressNL variable_mappings configured. We may need a data migration for this.

[vaszig]

Just a reminder for the translations and for https://github.com/open-formulieren/open-forms/pull/4751#issuecomment-2482412560

[sergei-maertens]

Just a reminder for the translations and for #4751 (comment)

I will do translations separately and I'll take a look at the data migration remark.