Support 2D copy in HardwareBufferToGlTextureConverter

Extend GlTextureCopier to support copying from standard 2D textures (internal RGBA). This is required to support color conversion (like HDR-to-SDR tone mapping) and crop/rotation for internal textures when the downstream effects chain is empty.

Always perform the copy pass (applying Y-flip) in HardwareBufferToGlTextureConverter to ensure output textures are in the consistent "upside-down in GL space" orientation expected by downstream components (like FrameWriterGlTextureFrameConsumer). This avoids incorrect flipped rendering that would occur if the copy was bypassed for right-side-up internal textures.

PiperOrigin-RevId: 941195353