Fix incorrect data in project_settings.has_confluence

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About

This issue is very similar in nature to #273574 (closed).

For the same reasons given in #290715 (closed) it's possible for the project_settings.has_confluence cache to be inconsistent.

Proposal

We should follow the same pattern of work performed for projects.has_external_wiki in the MR !50916 (merged) to update all incorrect records of project_settings.has_confluence in a database migration and make the column DEFAULT false and NOT NULL.