Rename SkiaGpuContext::isAbandoned to isAbandonedOrDeviceLost

In Ganesh, "abandoned" means either the context was explicitly
abandoned, or the underlying GPU API's "device" was lost.

In Graphite, there's only the concept of losing the device.

Test: compiles
Bug: b/293371537
Change-Id: I1bc69b799e9d7bdb3bde037f79b3736fc2023d70