chore: Remove deprecated Ownerships context

[Rockyy174]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider making the migration safer by using drop_if_exists table(:ownerships) so deployments in partially-migrated or inconsistent environments don’t fail if the table was already removed.
• If you ever need to roll this back, change/0 with a bare drop table(:ownerships) is not reversible by Ecto; consider switching to explicit up/0/down/0 callbacks so rollback behavior is clearly defined.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider making the migration safer by using `drop_if_exists table(:ownerships)` so deployments in partially-migrated or inconsistent environments don’t fail if the table was already removed.
- If you ever need to roll this back, `change/0` with a bare `drop table(:ownerships)` is not reversible by Ecto; consider switching to explicit `up/0`/`down/0` callbacks so rollback behavior is clearly defined.

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