fix(iOS): fix quick modal presentation sequence where foreign modal is being dismissed

[kkafar]

Description

Closes #2668

See the #2668 for issue description.

Making long story short: The issue involves cases when we have two modals A, b, where A is owned and b is foreign, and we
dismiss b and present another owned modal B in single transaction or in separate transactions but pulled quickly enough so that previous transitions (caused by previous transaction) are not finished yet.

Currently, because of b being dismissed by its host view controller, we would wrongfully dismiss the controller underneath (A). Now the code takes possibility of b being in dismissal into account.

Changes

We now check whether the potentially foreign modal is being dismissed - if so, we schedule our updates to run after dismissal transition completes.

Test code and steps to reproduce

Tested for regressions:

• Modal screen in Example PR
• Test2048 PR
• Test1829 PR
• Test1299 PR

This issue is quite similar to #1299 but concerns foreign modal not owned one and mechanism are a bit different, therefore I've added Test2668.

Checklist

• Included code example that can be used to test this change
• Ensured that CI passes

[kkafar]

Note

We need to automate these and regression test everything that can be tested 😅