Explicitely mention that the PyTorch easyblock needs updating when failing for this reason

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See https://github.com/easybuilders/easybuild-easyconfigs/pull/19666#issuecomment-1991295933 for the motivation

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@casparvl I updated the EasyBlock after the discussion at https://github.com/easybuilders/easybuild-easyblocks/pull/3255#discussion_r1524517112

I also noticed and fixed 2 things:

• If we can't count failures we only failed if we counted ANY failure
• We can't count failures if a test aborted but the previous iteration showed a message that the EasyBlock needed updating

I moved the detection of "uncounted suites" into the parser function such that we can test it (manually).