Drop TaskRun foreign key constraints

Author: matt-aitken

internal-packages/database/prisma/migrations/20260401000000_drop_taskrun_foreign_keys/migration.sql

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+-- Drop all foreign key constraints on TaskRun (no schema change, data intact)
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_runtimeEnvironmentId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_projectId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_lockedById_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_lockedToVersionId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_rootTaskRunId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_parentTaskRunId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_parentTaskRunAttemptId_fkey";
+ALTER TABLE "TaskRun" DROP CONSTRAINT IF EXISTS "TaskRun_batchId_fkey";