[branch-4.1](compaction) remove single replica compaction (#63771)#64061
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Remove the single replica compaction (SRC) feature end-to-end across BE, FE and regression tests. Doc: apache/doris-website#3870 ### Why remove it The main reason is **correctness risk in peer selection**. A follower replica had to pick a peer holding a "proper" version (`_find_rowset_to_fetch`) and fetch its compacted result, based on replica info that was only refreshed periodically. Because replicas progress through versions independently and this "leader" selection ran against a stale, time-sensitive view of the cluster, the hoice of which peer to fetch from — and which version — was racy and could select a peer whose state no longer matched, leading to subtle inconsistencies.
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yiguolei
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pick from master #63771