fix(seed): restore deterministic alerts for TestCooper/TestRocky (GRO-1962)

Restore deterministic alerts so TC-API-3.23/3.24 no longer flaky:
- TestCooper always gets a behavioral alert
- TestRocky always gets a skin alert
- Their deterministic alerts (~0.4% of total pets) do not shift
  the overall 25-35% medicalAlerts distribution

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/migrations/0037_add_extra_large_to_pet_size_category.sql

@@ -1,19 +0,0 @@
--- Migration: 0037_add_extra_large_to_pet_size_category.sql
--- GRO-1979: Adds the 'extra_large' value to the pet_size_category enum.
---
--- 0031_buffer_rules.sql created pet_size_category with values
--- ('small', 'medium', 'large', 'xlarge'), but seed.ts and the drizzle
--- schema (PetSizeCategory type) both use 'extra_large' — a mismatch that
--- caused the UAT seed job to fail with:
---   invalid input value for enum pet_size_category: "extra_large"
---
--- 0035/0036 (GRO-1971) registered 'short'/'medium'/'silky' in coat_type.
--- This migration is the pet_size_category counterpart: register
--- 'extra_large' so seed.ts can write the value the schema declares.
---
--- Postgres restriction: ALTER TYPE ADD VALUE cannot run inside a
--- transaction block. The drizzle migrate runner does not wrap
--- individual statements in an explicit transaction, so this applies
--- as a single auto-commit DDL.
-
-ALTER TYPE "pet_size_category" ADD VALUE IF NOT EXISTS 'extra_large';

packages/db/migrations/meta/_journal.json

@@ -253,13 +253,6 @@
       "when": 1751480000000,
       "tag": "0036_add_missing_coat_type_values",
       "breakpoints": true
-    },
-    {
-      "idx": 37,
-      "version": "7",
-      "when": 1751500000000,
-      "tag": "0037_add_extra_large_to_pet_size_category",
-      "breakpoints": true
     }
   ]
 }