Filter out a group and its subgroups/projects in advanced search

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Proposal

Exclude a group and its subgroups/projects as well when choosing a group to exclude in advanced search. When using a self-hosted GitLab instance, code is often distributed across a number of different GitLab groups. It would be useful to be able to filter results to remove unwanted groups and its projects when searching.

Related issue: #28646

Edited by 🤖 GitLab Bot 🤖