Deprecate CupertinoDialog class

Relevant PRs:

Deprecated in #20649

Removed in #73604

Cupertino navigation bars’ actionsForegroundColor

Supported by fix tool: No

Migration guide

Code before migration:

CupertinoNavigationBar

actionsForegroundColor:

CupertinoColors

systemBlue

);

CupertinoSliverNavigationBar

actionsForegroundColor:

CupertinoColors

systemBlue

);

Code after migration:

CupertinoTheme

data:

CupertinoThemeData

primaryColor:

CupertinoColors

systemBlue

),