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This decouples the Impeller on-by-default effort from the release schedule and [plugin migrations](https://github.com/flutter/flutter/issues/151018). The plugin migration documented in [go/impeller-plugin-migration][plugin-migration] is still recommended and facilitates zero-copy texture transfers between OpenGL and Vulkan. To recap, the plugin migration is to move away from the OpenGL-only SurfaceTexture APIs in the plugin interface. This patch facilitates rendering OpenGL textures in a Vulkan renderer using texture trampolining using a single device-device transfer on all devices that support Impeller using the Vulkan renderer. The performance of this approach is more than acceptable but at the cost of an additional texture allocation and will serve as a fallback to the for any remaining unmigrated plugins (all first-party plugins will already be migrated when the Impeller is on by default and we are following up on the migration of the major third-party plugins as well). This is a straight improvement to the current state of things were unmigrated plugins will render an empty quad.