Backfill missing changelog entries for v17 releases

What does this MR do?

Backfill missing changelog entries for v17 releases

Why was this MR needed?

-

What's the best way to test this MR?

while read v ; do
  echo -ne "changelog entries for ${v}:\t"
  grep -c "## ${v} (" CHANGELOG.md
done < <(
  git tag | grep '^v[0-9]\+\.[0-9]\+\.[0-9]\+$'
) | grep 'v17\.'

Shows that we have one (and only one) changelog entry for each version tag (for v17 releases)

What are the relevant issue numbers?

https://gitlab.com/gitlab-com/runner-group/team-tasks/-/issues/370

Merge request reports

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