Switch all gitlab_main_cell schema tables to gitlab_main_org

Tomasz Skoruparequested to merge
tskorupa/switch-all-gitlab_main_cell-tables-to-gitlab_main_org into master

What does this MR do and why?

Switch all gitlab_main_cell schema tables

Tables with schema gitlab_main_cell are being moved to gitlab_main_org: it's an identical schema, just better named.

Addresses #491034 (closed)

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