Fix MAUI missing breadcrumbs for lifecycle and UI events

[mattjohnsonpint]

I'm really not sure when this started happening, but I noticed that we are no longer getting any breadcrumbs for lifecycle and UI events in MAUI apps.

Running our MAUI sample shows only these:

The two breadcrumbs before the exception are from logging that the MAUI sample does, and are picked up by Sentry.Extensions.Logging. There's no indication of Application, Windows, or Button events as there used to be.

The last time I worked on this part of the MAUI code was with #2001 / #2006. It's possible the issue was introduced then. If so, I'm surprised we didn't notice until now. It's also possible that something changed in MAUI between then and now.

On investigation, it seems that MAUI's IPlatformApplication.Application property is not set until after the event we use. See here in the MAUI source code.

Thus, there are two options:

1. Bind at a later event, after the Application property has been resolved
2. Resolve the Application property ourselves through the Services container.

This PR takes the second approach, which appears to work:

I also went back and validated that this didn't regress #2001.