Only select from addrv2-capable peers for torv3 address relay

Summary:

When selecting peers to relay an address to, only pick addrv2-capable ones if the address cannot be represented in addr(v1).

Without this I expect that propagation of torv3 addresses over the cleartext network will be very hard for a while.

The parameter is named _addr to prevent a shadow warning (just like PushAddress).

Backport of core#20661.

Ref T1696.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Maniphest Tasks: T1696

Differential Revision: https://reviews.bitcoinabc.org/D10921