[v24.2.x] rpk: introduce license warnings messages

[vbotbuildovich]

Backport #23472 to branch v24.2.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 v24.2.x
git checkout -b vbotbuildovich/backport-23472-v24.2.x-839
git cherry-pick -x 1f1e0cd779 477ccb888e 9b69ce7708

git push origin vbotbuildovich/backport-23472-v24.2.x-839
gh pr create \
  --title "[v24.2.x] rpk: introduce license warnings messages" \
  --base "v24.2.x" \
  --label "kind/backport" \
  --head "vbotbuildovich/backport-23472-v24.2.x-839" \
  --draft \
  --repo "redpanda-data/redpanda" \
  --milestone "v24.2.x-next" \
  --body "Backport of PR https://github.com/redpanda-data/redpanda/pull/23472 "