Do not store errors in form component

[dominik-zeglen]

I want to merge this change because it makes handling form errors more explicit.

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #410 into master will increase coverage by 0.04%.
The diff coverage is 47.82%.

@@            Coverage Diff             @@
##           master     #410      +/-   ##
==========================================
+ Coverage   72.48%   72.53%   +0.04%     
==========================================
  Files         639      639              
  Lines        7120     7122       +2     
  Branches     1180     1181       +1     
==========================================
+ Hits         5161     5166       +5     
  Misses       1718     1718              
+ Partials      241      238       -3

Impacted Files	Coverage Δ
...ductVariantCreatePage/ProductVariantCreatePage.tsx	77.27% <ø> (ø)	⬆️
.../ShippingZoneCreatePage/ShippingZoneCreatePage.tsx	56.25% <ø> (ø)	⬆️
...mponents/ProductDetailsForm/ProductDetailsForm.tsx	100% <ø> (ø)	⬆️
.../ProductTypeDetailsPage/ProductTypeDetailsPage.tsx	67.85% <ø> (ø)	⬆️
...ributeValueEditDialog/AttributeValueEditDialog.tsx	77.77% <ø> (ø)	⬆️
...ts/CollectionDetailsPage/CollectionDetailsPage.tsx	100% <ø> (ø)	⬆️
...onents/AttributeProperties/AttributeProperties.tsx	100% <ø> (ø)	⬆️
...ts/CustomerCreateDetails/CustomerCreateDetails.tsx	100% <ø> (ø)	⬆️
...mponents/ProductVariantPage/ProductVariantPage.tsx	84.61% <ø> (ø)	⬆️
...discounts/components/VoucherValue/VoucherValue.tsx	90.9% <ø> (ø)	⬆️
... and 67 more

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[krzysztofwolski]

👌