Add mutations to associate and disassociate upstream from container virtual registry (#582490) · Issues · GitLab.org / GitLab · GitLab

Add mutations to associate and disassociate upstream from container virtual registry

## Context * Associate upstream API: https://docs.gitlab.com/api/container_virtual_registries/#associate-an-upstream-with-a-registry * Disassociate upstream API: https://docs.gitlab.com/api/container_virtual_registries/#disassociate-an-upstream-from-a-registry

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