BUG: Avoid incorrect broadcasts on non-core outputs in gufuncs

Mark the core dimensions as reduce axis. This allows them to be
freely broadcast (basically ignored for most practical purposes)
while other axes are normally broadcast even though the operand is
read-only or write-only.
If we were to use read-write operands with `REDUCE_OK` these
additional dimensions are currently simply absored as reduction
dimensions...

(I hope this is understandable, please see the issues/test
for an example...)

Fixes gh-15139, replaces gh-15142

Co-Authored-By: Marten van Kerkwijk <mhvk@astro.utoronto.ca>

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