[ads] Sanity test iOS NotifyTabDidChange business logic

[tmancey]

Sanity test:

• Confirm that we do NOT call ads_service_->NotifyTabDidChange if restoring a tab [Works for me]
• Confirm that we do NOT call ads_service_->NotifyTabDidChange if the tab is NOT a new navigation (user tapped forward/back button or refreshed the tab) [Filed [ads] Back/forward page transitions should not trigger NotifyTabDidChange #38279]
• Confirm that we do NOT call ads_service_->NotifyTabDidChange if the redirect chain is empty [Works for me]
• Confirm that we call ads_service_->NotifyTabDidChange if the tab web content is a single page application (same document) [Filed https://github.com/[ads] iOS same document page navigations should trigger NotifyTabDidChange #38272]
• Confirm that we call ads_service_->NotifyTabDidChange if the tab web content is a multi page application (document changed) [Works for me]

Please fix any bugs via this issue because they would affect inline content ads and site visits. See desktop/Android business logic in brave/browser/brave_ads/tabs/ads_tab_helper.cc.