[NCL-9317] Add a primary key for deliverableartifact table

[akridl]

Checklist:

• Have you added unit tests for your change?

[akridl]

if we want to do this, we need to set distribution_id of the table deliverableartifact (hence additional edit of the script would be needed), since we are changing the deliverableartifact_pkey from unique to primary key (and primary key requires alongside the uniqueness also non-nullness as well)

[akridl]

retest this please