`avoid_reuse` support for non-`sendtoaddress` calls #17706

sendmany, bumpfee and others should ideally contain something like this block:

    coin_control.m_avoid_address_reuse = GetAvoidReuseFlag(pwallet, request.params[8]);
    // We also enable partial spend avoidance if reuse avoidance is set.
    coin_control.m_avoid_partial_spends |= coin_control.m_avoid_address_reuse;

to avoid leakage

hmm this also has to be done for *fund* RPCs and any new coin selection services we end up providing at any endpoint.

beginning to think we should solve this more systematically than #17712 cc @promag

Anything that uses AvailableCoins will already do this: https://github.com/bitcoin/bitcoin/blob/master/src/wallet/wallet.cpp#L2037

huh, I guess sendtoaddress case is just indirection. Fairly confident we have coverage, just hard to read code.