Add NOT NULL on analytics_devops_adoption_segments#namespace_id

Tomasz Skoruparequested to merge
tskorupa/add-not-null-to-analytics_devops_adoption_segments-on-namespace_id into master

What does this MR do and why?

Add NOT NULL on adas#namespace_id

Add NOT NULL to analytics_devops_adoption_segments#namespace_id

Addresses #555251

Follows up on cc6cb9bd

There are no rows with analytics_devops_adoption_segments#namespace_id IS NULL on gitlab.com (https://postgres.ai/console/gitlab/gitlab-production-main/sessions/42394/commands/129936)

The attribute is already enforced in the model (https://gitlab.com/gitlab-org/gitlab/-/blob/11d074d349a6f538ec6513ce6ac034832ae7ed91/ee/app/models/analytics/devops_adoption/enabled_namespace.rb\#L13).

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