[v24.1.x] archival: skip spillover retention if not collectable

[vbotbuildovich]

Backport #23358 to branch v24.1.x. Note that this issue was created as a placeholder, since the original PR's commit(s) could not be automatically cherry-picked.
Here are the commands to execute:

git checkout v24.1.x
git checkout -b vbotbuildovich/backport-23358-v24.1.x-862
git cherry-pick -x 26df815465dc2cfd68e716e0936d1bdc99bb248b

git push origin vbotbuildovich/backport-23358-v24.1.x-862
gh pr create \
  --title "[v24.1.x] archival: skip spillover retention if not collectable" \
  --base "v24.1.x" \
  --label "kind/backport" \
  --head "vbotbuildovich/backport-23358-v24.1.x-862" \
  --draft \
  --repo "redpanda-data/redpanda" \
  --milestone "v24.1.x-next" \
  --body "Backport of PR https://github.com/redpanda-data/redpanda/pull/23358 "

JIRA Link: [CORE-7344](https://redpandadata.atlassian.net/browse/CORE-7344)