chore(gooddata-sdk): make UpsertOutcome str() match StrEnum

str(UpsertOutcome.CREATED) returned "UpsertOutcome.CREATED"; with
__str__ = str.__str__ it returns "created", so swapping the base class
for StrEnum once py3.10 support is dropped is a no-op for callers.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: vondravl

packages/gooddata-sdk/src/gooddata_sdk/catalog/types.py

@@ -18,3 +18,7 @@ class UpsertOutcome(str, Enum):
 
     CREATED = "created"
     UPDATED = "updated"
+
+    # Match StrEnum's str() (the value, not "UpsertOutcome.CREATED") so moving
+    # to StrEnum once py3.10 support is dropped is a no-op for callers.
+    __str__ = str.__str__

packages/gooddata-sdk/tests/catalog/test_upsert_outcome.py

@@ -136,6 +136,12 @@ def test_workspace_setting(self):
 
 @pytest.mark.parametrize("outcome", list(UpsertOutcome))
 def test_outcome_is_a_plain_string(outcome):
-    """The str mixin keeps the value usable in logs and comparisons on py3.10."""
+    """The str mixin keeps the value usable in logs and comparisons on py3.10.
+
+    The str()/format() assertions pin the `__str__ = str.__str__` override, so
+    swapping the base for StrEnum once py3.10 is dropped stays a no-op.
+    """
     assert isinstance(outcome, str)
     assert outcome == outcome.value
+    assert str(outcome) == outcome.value
+    assert f"{outcome}" == outcome.value