Add bitcoin-{node,gui} to release binaries for IPC

Have depends make libmultiprocess by default, which has the effect of including it in the release binaries. Except for Windows and OpenBSD which are not supported yet, the latter due to a fairly trivial upstream issue.

The initial main use case is to enable experimental support for the Mining IPC interface. A working example of a Stratum v2 Template Provider client using this interface can be found here: https://github.com/Sjors/bitcoin/pull/48.

Additionally the bitcoin-node and bitcoin-gui are added to Maintenance.cmake.

Builds on #30975 (which originally tried to do this) and #31741.

See #31756 for discussion of when this should happen. See also #31098 for any remaining issues specific to the Mining interface. Will keep this draft for now.

Guix hashes:

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