Fix for "No tests discovered on macOS Tahoe" https://github.com/mattstevens/xcode-googletest/issues/12

[eugenegff]

Fix for "No tests discovered on macOS Tahoe" #12

Fix has 3 places where it attempts to perform tests registration, unfortunately all places has some drawbacks

1. original one on NSBundleDidLoadNotification, but that notification does not happens on macOS 26 and iOS 26
2. dispatch_async, but it sometimes happens too late
3. in principal class initializer, requires NSPrincipalClass entry in Info.plist

[eugenegff]

Merged into https://github.com/eugenegff/xcode-googletest fork