Move evidence to measure level

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/migrations/20250503T142200Z.sql

@@ -0,0 +1,9 @@
+ALTER TABLE evidences ALTER COLUMN task_id DROP NOT NULL;
+ALTER TABLE evidences ADD COLUMN measure_id TEXT REFERENCES measures(id);
+
+UPDATE evidences e
+SET measure_id = t.measure_id
+FROM tasks t
+WHERE e.task_id = t.id AND e.measure_id IS NULL;
+
+ALTER TABLE evidences ALTER COLUMN measure_id SET NOT NULL;