[backport#16026] Ensure that uncompressed public keys in a multisig always returns a legacy address
Summary:
a49503402b6bc21e3878e151c07529941d36aed0 Make and get the multisig redeemscript and destination in one function instead of two (Andrew Chow)
Pull request description:
`CreateMultisigRedeemscript()` is changed to `AddAndGetMultisigDestination()` so that the process of constructing the redeemScript and then getting the `CTxDestination` are done in the same function. This allows that function to see what the keys in the multisig are so that the correct address type is returned from `AddAndGetDestinationForScript()`. This only effects the `createmultisig` and `addmultisigaddress` RPCs and does not change signing logic as #16022 does. Alternative to #16022 and #16012 Fixes #16011
Backport of Core PR16026
Test Plan:
ninja check-all
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Subscribers: deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D6552