Revert creation of repostiory_read_only column in namespaces tables
What does this MR do?
This MR undoes !51800 (merged) because it was impossible to get the lock in production to create the column in that table.
Incident issue gitlab-com/gl-infra/production#3390 (closed)
Does this MR meet the acceptance criteria?
Conformity
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Separation of EE specific content
Refs #299052 (closed)
Edited by Francisco Javier López (ex-Gitlab)