* Enforce goals unique

* Remove unnecessary alias

* Skip tests that can no longer run anymore

To run, make sure the migration from
priv/repo/migrations/20230914071245_goals_unique.exs
is rolled back.

* Use separate transactions for the migration

* Update priv/repo/migrations/20230914071245_goals_unique.exs

Co-authored-by: Adrian Gruntkowski <adrian.gruntkowski@gmail.com>

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Co-authored-by: Adrian Gruntkowski <adrian.gruntkowski@gmail.com>