v2.2: remove duplicates from fanout leaders (backport of #5109) #5138
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Currently, when sending transactions to future leaders, duplicate leaders may appear in consecutive slots, resulting in unnecessary spam. This PRs removes duplicates from the fanout leaders set. (cherry picked from commit 62acd94)
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Problem
Currently, when sending transactions to future leaders, duplicate leaders may appear in consecutive slots, resulting in unnecessary spam.
Summary of Changes
Remove duplicates from the fanout leaders set.
This is an automatic backport of pull request #5109 done by [Mergify](https://mergify.com).