Remove v0.8.28 runtime migrations (#2496)

* remove v0.8.28 runtime migrations

* Update runtime/westend/src/lib.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* commit suggestions

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
10 jobs for master in 33 minutes and 25 seconds (queued for 2 seconds)