[Repo Assist] test: expand TaskSeq.fold tests with call-count, ordering, and edge case coverage#348

dsyme merged 2 commits intomainfsprojects/FSharp.Control.TaskSeq:mainfrom

repo-assist/improve-fold-tests-20260316-10feb1bd15349016fsprojects/FSharp.Control.TaskSeq:repo-assist/improve-fold-tests-20260316-10feb1bd15349016Copy head branch name to clipboard