Draft: Move table schemas away from gitlab_main

Tomasz Skoruparequested to merge
tskorupa/no-tables-are-classified-as-gitlab_main into master

What does this MR do and why?

Addresses the exit criteria of &11670.

For reference, the gitlab_main schema is deprecated: https://docs.gitlab.com/development/cells/\#available-cells--organization-schemas

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Edited by Tomasz Skorupa

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