[MySQL]: Release connection from pool in iterator() rather than close
#4118
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Addresses #2143 with select iterators with trivial fix to release the borrowed connection from the pool rather than attempt to destroy it
I did try to add some test coverage but couldn't find away to effectively verify the release vs end behaviour, especially consider
.end()is an alias for.release(). It does however remove the warning ensuring this code won't regress with future versions ofmysql2