[v25.1.x] rptest: add "assert-ref-snapshot-id" to log allow list

[vbotbuildovich]

Backport #27758 to branch v25.1.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 v25.1.x
git checkout -b manual-backport-27758-v25.1.x-904
git cherry-pick -x ec0f03fb29

git push origin manual-backport-27758-v25.1.x-904
gh pr create \
  --title "[v25.1.x] rptest: add "assert-ref-snapshot-id" to log allow list" \
  --base "v25.1.x" \
  --label "kind/backport" \
  --head "manual-backport-27758-v25.1.x-904" \
  --draft \
  --repo "redpanda-data/redpanda" \
  --milestone "v25.1.x-next" \
  --body "Backport of PR https://github.com/redpanda-data/redpanda/pull/27758 "