ci: retain API unit test reports

[hyoban]

Summary

Retain separate JUnit reports for parallel API unit tests and serial controllers for seven days. Upload reports after failures when available, providing testcase identities and durations for CI validation. Unbuffer Python output for timely logs. Test scheduling and coverage remain unchanged in this layer.

Fixes #42582

Stack layer 1/5. Next: #42585 (remove real waits).

Validation

• JUnit reporting was validated in the baseline CI; collection timing and extra slow-phase output from that experiment have been removed.
• Ten focused tests passed serially and with two xdist workers; both JUnit files contained ten cases with durations.
• Ruff, targeted Pyrefly, and Actionlint checks passed.

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've verified the change and added or updated tests where meaningful regression risk justifies coverage.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	64.94%	64.95%	+0.00%
Strict coverage	64.55%	64.55%	+0.00%
Typed symbols	47,120	47,129	+9
Untyped symbols	25,591	25,592	+1
Modules	3415	3416	+1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.56%. Comparing base (3a0acfe) to head (5f4e55f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #42583      +/-   ##
==========================================
- Coverage   87.56%   87.56%   -0.01%     
==========================================
  Files        5480     5480              
  Lines      317375   317375              
  Branches    63615    63615              
==========================================
- Hits       277896   277894       -2     
- Misses      34114    34117       +3     
+ Partials     5365     5364       -1     

Flag	Coverage Δ
api	87.23% <ø> (-0.01%)	⬇️

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[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-09-20 10:02:10.722655841 +0000
+++ /tmp/pyrefly_pr.txt	2026-09-20 10:02:02.786603643 +0000
@@ -147,13 +147,13 @@
 ERROR Missing argument `using_ugc` in function `dify_vdb_lindorm.lindorm_vector.LindormVectorStore.__init__` [missing-argument]
   --> providers/vdb/vdb-lindorm/tests/integration_tests/test_lindorm.py:41:41
 ERROR Object of class `ModuleType` has no attribute `BulkIndexError` [missing-attribute]
-  --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:39:5
-ERROR Object of class `ModuleType` has no attribute `bulk` [missing-attribute]
   --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:40:5
+ERROR Object of class `ModuleType` has no attribute `bulk` [missing-attribute]
+  --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:41:5
 ERROR Object of class `ModuleType` has no attribute `OpenSearch` [missing-attribute]
-  --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:42:5
-ERROR Object of class `ModuleType` has no attribute `helpers` [missing-attribute]
   --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:43:5
+ERROR Object of class `ModuleType` has no attribute `helpers` [missing-attribute]
+  --> providers/vdb/vdb-lindorm/tests/unit_tests/test_lindorm_vector.py:44:5
 ERROR Object of class `ModuleType` has no attribute `MoVectorClient` [missing-attribute]
   --> providers/vdb/vdb-matrixone/tests/unit_tests/test_matrixone_vector.py:31:5
 ERROR Object of class `ModuleType` has no attribute `client` [missing-attribute]
@@ -6685,13 +6685,13 @@
 ERROR Object of class `NoneType` has no attribute `get_data` [missing-attribute]
    --> tests/unit_tests/services/test_audio_service.py:828:16
 ERROR Argument `BillingInfo` is not assignable to parameter `result` with type `dict[Unknown, Unknown]` in function `TestBillingServiceSubscriptionInfoDataType._assert_billing_info_types` [bad-argument-type]
-    --> tests/unit_tests/services/test_billing_service.py:1875:41
+    --> tests/unit_tests/services/test_billing_service.py:1898:41
 ERROR Argument `BillingInfo` is not assignable to parameter `result` with type `dict[Unknown, Unknown]` in function `TestBillingServiceSubscriptionInfoDataType._assert_billing_info_types` [bad-argument-type]
-    --> tests/unit_tests/services/test_billing_service.py:1884:41
+    --> tests/unit_tests/services/test_billing_service.py:1907:41
 ERROR Argument `BillingInfo` is not assignable to parameter `result` with type `dict[Unknown, Unknown]` in function `TestBillingServiceSubscriptionInfoDataType._assert_billing_info_types` [bad-argument-type]
-    --> tests/unit_tests/services/test_billing_service.py:1897:41
+    --> tests/unit_tests/services/test_billing_service.py:1920:41
 ERROR Argument `BillingInfo` is not assignable to parameter `result` with type `dict[Unknown, Unknown]` in function `TestBillingServiceSubscriptionInfoDataType._assert_billing_info_types` [bad-argument-type]
-    --> tests/unit_tests/services/test_billing_service.py:1908:41
+    --> tests/unit_tests/services/test_billing_service.py:1931:41
 ERROR Argument `FakeRepo` is not assignable to parameter `workflow_run_repo` with type `APIWorkflowRunRepository | None` in function `services.retention.workflow_run.clear_free_plan_expired_workflow_run_logs.WorkflowRunCleanup.__init__` [bad-argument-type]
    --> tests/unit_tests/services/test_clear_free_plan_expired_workflow_run_logs.py:130:49
 ERROR Class member `FailingRepo.delete_runs_with_related_by_ids` overrides a member in a parent class but is missing an `@override` decorator [missing-override-decorator]