Add changelog

Author: AutoPrFromHttpClientPython

.chronus/changes/enable-skipped-python-tests-2026-4-8-8-47-0.md

@@ -0,0 +1,8 @@
+---
+changeKind: internal
+packages:
+  - "@autorest/python"
+  - "@azure-tools/typespec-python"
+---
+
+Enable previously skipped client structure and client operation group mock API tests after TCGC 0.67.0 upgrade; remove obsolete `test_spread_record_discriminated_union` tests whose Spector scenario was removed.