[Android] Use `EdgeToEdge.enableEdgeToEdge` to set edge-to-edge mode instead of `View` flags

[camsim99]

Currently, to enable edge-to-edge, we use deprecated View flags (see source). These have long been deprecated (this is part of #98602), but the encouraged way to set edge-to-edge mode is EdgeToEdge.enableEdgeToEdge.

We should swap out our old method with EdgeToEdge.enableEdgeToEdge because users may see confusing warnings about not having enabled edge to edge on Android < 15 when they actually do set SystemUiMode.edgeToEdge to put their app in edge-to-edge mode. I believe the warning is coming up because we do not use SystemUiMode.edgeToEdge exactly.

[camsim99]

Related: #133074. Fixing this issue would be part of the work to remove our dependency on View flags for the different layout modes. Note, though, that edge-to-edge is the default on Android 15 and will soon be enforced, possibly making the old modes lower priority.