dg2: re-enable flaky tests
The following category of tests appears to be stable:
dEQP-VK.api.copy_and_blit.copy_commands2.blit_image.all_formats.generate_mipmaps
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The following category of tests appears to be stable:
dEQP-VK.api.copy_and_blit.copy_commands2.blit_image.all_formats.generate_mipmaps