Fix a crash when double-tap the Skip button in the site creation flow #25057
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Description
The crash happens because the first screen and the second screen both have a
rightBarButtonItem, whose action calls the same function (eventually). When double-tapping the "Skip" button, the first tap is handled by the first screenSiteIntentViewController, and the second tap is handled by the second screenSiteDesignContentCollectionViewController. Both bar button items trigger the same code:WizardNavigation.nextStep. The internal step ofWizardNavigationis not updated because the view controllers are still transitioning.This PR fixes the issue by disabling the second Skip button during the push animation.
Testing instructions
Enter the WordPress.com site creation flow, and double-tap the Skip button.