[v23.1.x] storage: fix coroutine iteration over _segs #11969
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Noah noted that the current iteration is unsafe because nothing ensures that _segs iterators remain stable across the scheduling points. This patch fixes this by collecting all-bogus segments and tweaking them at the end of the method, where we can guarantee that the container doesn't change. (cherry picked from commit 9a9813b)
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Backport of PR #11956