fix: make sure the reset_team trait actually sets the owner

[rflechtner]

Fixes https://github.com/KILTprotocol/ticket/issues/3802

Changes the reset_team trait to actually set the owner passed to the function.

The trait implementation is a back-port of a trait implemented in latest versions of pallet-assets (https://docs.rs/pallet-assets/41.0.0/pallet_assets/pallet/struct.Pallet.html#impl-ResetTeam%3C%3CT+as+Config%3E::AccountId%3E-for-Pallet%3CT,+I%3E). Changing ownership of an asset is part of this trait but was not implemented here as not needed.
Nevertheless, we're adding this now to avoid mismatched expectations.

TBD

• Update benchmarking to cover the case where the current owner != the desired owner.

Checklist:

• I have verified that the code works
  • No panics! (checked arithmetic ops, no indexing array[3] use get(3), ...)
• I have verified that the code is easy to understand
  • If not, I have left a well-balanced amount of inline comments
• I have left the code in a better state
• I have documented the changes (where applicable)
  • Either PR or Ticket to update the Docs
  • Link the PR/Ticket here

[rflechtner]

@ntn-x2 pinging you to have a look at this issue. What do you think about the implementation of ownership change?

[ntn-x2]

Do not clone() as part of the benchmark itself, but do it before.

[rflechtner]

e1670e6