Fixed issue with modals containing invalid/redundant scrolls

[kamilpastuszka]

I want to merge this change to fix issue with invalid/redundant scrolls for some modals.

Requirements for testing:

Prior to testing, a respective Macaw-UI version needs to be installed, as some of the changes have been moved there. They are now available under the hash commit 73dcbb3.
It can be done via the following command:

npm i https://github.com/mirumee/macaw-ui.git#73dcbb3

PR intended to be tested with API branch:

Examples of usage:

Assign Channels to Products

Add Product to Draft Order

Assign Collection to Sales

Shipping - Assign Countries

Pull Request Checklist

1. This code contains UI changes
2. All visible strings are translated with proper context including data-formatting
3. Attributes [data-test-id] are added for new elements
4. Changes are mentioned in the changelog
5. The changes are tested in different browsers and in light/dark mode

Test environment config

API_URI=https://qa.staging.saleor.cloud/graphql/

[patrys]

Task linked: SALEOR-2649 Assign modals contains invalid or redundant scrolls