Update test expectations for schedule key_properties change from [id, project-slug] to [id, project_id]

- Updated tests/base.py to expect primary_keys: {id, project_id} for schedule stream
- This aligns with the schema change adding project_id field
- Fixes test failures: test_all_fields, test_automatic_fields, test_bookmark, test_discovery, test_interrupted_sync, test_start_date

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: leslievandemark

tests/base.py

@@ -101,7 +101,7 @@ def expected_metadata(self):
                 self.PARENT_TAP_STREAM_ID: "collaborations",
             },
             "schedule": {
-                self.PRIMARY_KEYS: {"id"},
+                self.PRIMARY_KEYS: {"id", "project_id"},
                 self.REPLICATION_METHOD: self.INCREMENTAL,
                 self.OBEYS_START_DATE: True,
                 self.REPLICATION_KEYS: {"updated-at"},