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hadrian: Reduce Cabal verbosity

Matthew Pickering requested to merge wip/reduce-cabal-verbosity-24338 into master

The comment claims that simpleUserHooks decrease verbosity, and it does, but only for the postConf phase. The other phases are too verbose with -V.

At the moment > 5000 lines of the build log are devoted to output from cabal copy.

So I take the simple approach and just decrease the verbosity level again.

If the output of postConf is essential then it would be better to implement our own UserHooks which doesn't decrease the verbosity for postConf.

Fixes #24338 (closed)

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