[12.0][FIX] base_import_module_group: fix group external id and add test
/ocabot rebase
Congratulations, PR rebased to 12.0.
@yankinmax Tests are failing on "Cannot set admin user as a readonly user"
@thomaspaulb thanks for your response on that. Unfortunately, I don't have time to set up v12 to check this PR. I'm very sorry about this. If you need this to be merged you can try to fix by yourself. I propose to open new PR and ping me on that.
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