Remove nextest special case about yanking

See
https://github.com/taiki-e/install-action/issues/1881#issuecomment-4562483097

main.sh

@@ -254,29 +254,6 @@ read_manifest() {
     exact_version="${version}"
   else
     manifest=$(jq -r --arg version "${exact_version}" '.[$version]' "${manifest_dir}/${tool}.json")
-    if [[ "${rust_crate}" != "null" ]]; then
-      # TODO: don't hardcode tool name and use 'immediate_yank_reflection' field in base manifest.
-      case "${tool}" in
-        cargo-nextest)
-          crate_info=$(retry curl --user-agent "${ACTION_USER_AGENT}" --proto '=https' --tlsv1.2 -fsSL --retry 10 "https://crates.io/api/v1/crates/${rust_crate}" || true)
-          if [[ -n "${crate_info}" ]]; then
-            while true; do
-              yanked=$(jq -r --arg version "${exact_version}" '.versions[] | select(.num == $version) | .yanked' <<<"${crate_info}")
-              if [[ "${yanked}" != "true" ]]; then
-                break
-              fi
-              previous_stable_version=$(jq -r '.previous_stable_version' <<<"${manifest}")
-              if [[ "${previous_stable_version}" == "null" ]]; then
-                break
-              fi
-              info "${tool}@${exact_version} is yanked; downgrade to ${previous_stable_version}"
-              exact_version="${previous_stable_version}"
-              manifest=$(jq -r --arg version "${exact_version}" '.[$version]' "${manifest_dir}/${tool}.json")
-            done
-          fi
-          ;;
-      esac
-    fi
   fi
 
   case "${host_os}" in