Make Mortality Events available to Blazer

[CraigJZ]

Currently, the Mortality Events table is not available to Blazer but we need to include data from this table in our queries. The mortality events table does not have an organization_id field which is what the Blazer rake task currently looks for when setting row level security.

• Add organization_id column to mortality events
• Update code to scope mortality events to an organization
• Update the Blazer rake task to include Mortality Events
• Update tests accordingly
• Update seed data accordingly

[that-jill]

Sounds reasonable. I understand it's blocking some of Power's other Abalone-related work, so I'm going to try to tackle this asap

[that-jill]

@CraigJZ looks like you have a lovely helper for scoping to an organization. Can I safely use that for the same PR that adds the relation? I can update the referenced rake task/seeds/specs -- I just want to make sure that including the validation (validates :organization, presence: true) won't cause any issues with preexisting data anywhere.