[v24.3.x] [CORE-12756] storage: reset batch cache during adjacent merge compaction #26739
Description
Backport #26732 to branch v24.3.x. This issue was created as a placeholder because the original PR's commit(s) could not be automatically cherry-picked.
Here are the commands to execute:
git checkout v24.3.x
git checkout -b manual-backport-26732-v24.3.x-431
git cherry-pick -x 56590ef6e4
git push origin manual-backport-26732-v24.3.x-431
gh pr create \
--title "[v24.3.x] [CORE-12756] `storage`: reset batch cache during adjacent merge compaction" \
--base "v24.3.x" \
--label "kind/backport" \
--head "manual-backport-26732-v24.3.x-431" \
--draft \
--repo "redpanda-data/redpanda" \
--milestone "v24.3.x-next" \
--body "Backport of PR https://github.com/redpanda-data/redpanda/pull/26732 "
[CORE-12756]: https://redpandadata.atlassian.net/browse/CORE-12756?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ
JIRA Link: [CORE-12764](https://redpandadata.atlassian.net/browse/CORE-12764)
[CORE-12764]: https://redpandadata.atlassian.net/browse/CORE-12764?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ