Remove table truncates in `pg` fixture
Remove table truncates in `pg` fixture

Trying to avoid the following: 
>                   raise translated_error from error
E                   sqlalchemy.exc.DBAPIError: (sqlalchemy.dialects.postgresql.asyncpg.Error) <class 'asyncpg.exceptions.FeatureNotSupportedError'>: cannot truncate a table referenced in a foreign key constraint
E                   DETAIL:  Table "sample_reads_files" references "uploads".
E                   HINT:  Truncate table "sample_reads_files" at the same time, or use TRUNCATE ... CASCADE.
E                   [SQL: TRUNCATE uploads]
E                   (Background on this error at: http://sqlalche.me/e/14/dbapi)
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