set CTest timeout to 0

clang dbg has some failing tests because CTest kills them after 1500s.
This sets this default timeout to 0, as timeouts are handled by Gaudi.

Let's follow the discussion about this at: Moore!923 (comment 4641609)

Upstream fix is in gaudi/Gaudi!1233 (merged) (after merging that we can drop the workaround here)

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• 118bed0e - set CTest default timeout to 0

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• [2021-07-12 16:11] Validation started with lhcb-master-mr#2560

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mentioned in commit 427d25b0