[#1052-4]Feature/ haalcentraal contact data

[vaszig]

In this PR I added an extra check (is_prepopulated=True, which is True when we use BRP in combination with DigiD) in order to disable the fields and show Mijn gegevens to the user.
If we want the form fields disabled generally with DigiD I will have to update this accordingly.

[codecov-commenter]

Codecov Report

Merging #430 (7376162) into develop (6993c5e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #430      +/-   ##
===========================================
+ Coverage    96.28%   96.29%   +0.01%     
===========================================
  Files          469      470       +1     
  Lines        15596    15640      +44     
===========================================
+ Hits         15017    15061      +44     
  Misses         579      579              

Impacted Files	Coverage Δ
src/open_inwoner/accounts/forms.py	97.96% <100.00%> (+0.06%)	⬆️
...oner/accounts/migrations/0053_user_display_name.py	100.00% <100.00%> (ø)
src/open_inwoner/accounts/models.py	97.78% <100.00%> (+<0.01%)	⬆️
.../open_inwoner/accounts/tests/test_profile_views.py	100.00% <100.00%> (ø)
src/open_inwoner/accounts/views/profile.py	99.13% <100.00%> (+0.03%)	⬆️

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[alextreme]

General idea is good, however thinking about the edit-profile view there isn't much point in showing all the disabled fields if the User is prepopulated, and the opt-out structure feels a bit brittle (easy to add new fields to the form that might be made editable by accident).

How about we go for 2 forms: one where the User is prepopulated and one where this isn't the case. The former would only contain the fields that are actually editable.

[vaszig]

@alextreme I agree, the only reason I did this in one form was because the task is about making specific fields readonly. Now that we are going for two separate forms this does not seem to be needed.

[alextreme]

This is fine. Was there a separate task for updating the NecessaryUserForm?

[vaszig]

This is fine. Was there a separate task for updating the NecessaryUserForm?

Yes, this is the task (#1055) that I am working now.