29898 Cherrypick #29783 and #29862 to flutter-2.8-candidate.7 (platform-ios, cla: yes)

29930 [ios platform view] fix overlay zPosition (platform-ios, cla: yes, waiting for tree to go green)

29996 Removed the email warning about notifications entitlement (platform-ios, cla: yes)

30037 [flutter_releases] Flutter beta 2.8.0-3.3.pre Engine Cherrypicks (platform-ios, cla: yes)

30090 Update IosUnitTests to use iPhone 11 simulator (platform-ios, cla: yes, waiting for tree to go green)

30162 Cherrypick #29862 for b/208763970 (platform-ios, cla: yes)