This patch extends the usage_by_menu method to also consider the usage
of the menu socket in the make available and usage inference callbacks.
This essentially means that if a socket depends on menu B which, in
turn, depends on menu A, it will be sufficiently to check the value of
menu B, while A will be checked recursively.
The single variant of the usage_by_menu function is now implemented in
terms of its overloaded vector variant for code deduplication since the
new code increase the size quite a bit.
Pull Request: https://projects.blender.org/blender/blender/pulls/146141
68bccbaeee