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arb_copy_image: test copying of different mipmap levels of a texture

Danylo Piliaiev requested to merge GL/piglit:tests/arb_copy_image-layers-copy into main

Tests that glCopyImageSubData correctly copies all levels of a texture.
Also tests that the order in which levels are initialized doesn't affect the copying (some drivers, e.g. gallium drivers, may be sensitive to the initialization order).

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