Add primary key to catalog_inputs

When scoping this feature we specifically omitted any work to optimize storage/queries in order to limit the first round work. By doing this we also omitted a primary key, which means the table cannot be cleaned up by pg_repack. We should add a primary key to the table.

I believe this would work as a primary key.

ALTER TABLE catalog_inputs ADD CONSTRAINT catalog_inputs_pkey PRIMARY KEY (type, name, certname_id);

If we allow customers to add it ahead of time as a workaround, we'll need to preface the ADD CONSTRAINT command in the migration with the below command to drop the primary key because ADD CONSTRAINT doesn't support IF NOT EXISTS.

ALTER TABLE catalog_inputs DROP CONSTRAINT IF EXISTS catalog_inputs_pkey;