Drop namespace_settings.product_analytics_enabled column

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Overview

Remove the need for SaaS to configure Product A... (!147833 - merged) • Max Woolf • 16.11 removes the need for the namespace_settings.product_analytics_enabled column. We should drop the column from the database.

Implementation plan

• Drop the namespace_settings.product_analytics_enabled column following the multi-milestone process to drop a column.
  • https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#dropping-columns