MM-48614: saves priority for drafts (#21752)

* MM-48614: saves priority for drafts

Adds a new column in the drafts table, "priority".
This way we can save post's priority in the draft.

Fixes OmitConnectionId, which when you published a ws event for a user
was getting bypassed.

Fixes Get for drafts returns deleted ones as well, which is needed for
upsert.

* Adds test case for the OmitConnectionId

* Addresses review comments, removes DeleteAt

* Vets

* Adds missing translation

* Re-instates DeleteAt column

* Adds separate case to get draft including deleted

* Fixes Update Draft

* Empty

db/migrations/postgres/000100_add_draft_priority_column.down.sql

@@ -0,0 +1 @@
+ALTER TABLE drafts DROP COLUMN IF EXISTS priority;

db/migrations/postgres/000100_add_draft_priority_column.up.sql

@@ -0,0 +1 @@
+ALTER TABLE drafts ADD COLUMN IF NOT EXISTS priority text;