migrate pallet-nft-fractionalization to benchmarking v2 syntax (#6301)
Migrates pallet-nft-fractionalization to benchmarking v2 syntax. Part of: * #6202 --------- Co-authored-by: Giuseppe Re <[email protected]> Co-authored-by: GitHub Action <[email protected]> Co-authored-by: Bastian Köcher <[email protected]>