Bug/Feature: Should variants be automatically added in multiple channels, if the parent product is in multiple channels?

[martijnvdbrug]

Describe the bug
Currently, product variants are only added in the current channel, even if the parent product is in multiple channels.

To Reproduce
Steps to reproduce the behavior:

1. Create two channels: ChannelA and ChannelB
2. Create a product in ChannelA, and assign the product also to ChannelB
3. Create a new variant for the product in ChannelA
4. The variant is now not visible in ChannelB

Expected behavior
I would expect the new variant to be automatically assigned to ChannelB. Product options are visible in both channels, so it is a bit strange to see product options in both channels, but a 'missing' variant in ChannelB.

Environment (please complete the following information):

• @vendure/core version: 3.1.1
• Nodejs version 18
• Database (mysql/postgres etc): MySQL

[github-actions]

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