Also expose FlowRunFailedException and FlowRunCancelledException at top level

Same shape and same private-path problem as the Job exceptions this PR is
already fixing. flow_runs.wait_for_flow_run() raises these; users need to
catch them without importing from server.endpoint.exceptions.

Add regression tests for both pairs so a future refactor of __init__.py
can't silently break the public surface.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jacalata

tableauserverclient/__init__.py

@@ -67,6 +67,8 @@
     RequestOptions,
     MissingRequiredFieldError,
     FailedSignInError,
+    FlowRunCancelledException,
+    FlowRunFailedException,
     JobCancelledException,
     JobFailedException,
     NotSignedInError,
@@ -100,6 +102,8 @@
     "FileuploadItem",
     "Filter",
     "FlowItem",
+    "FlowRunCancelledException",
+    "FlowRunFailedException",
     "FlowRunItem",
     "get_versions",
     "GroupItem",

tableauserverclient/server/__init__.py

@@ -14,6 +14,8 @@
 from tableauserverclient.server.pager import Pager
 from tableauserverclient.server.endpoint.exceptions import (
     FailedSignInError,
+    FlowRunCancelledException,
+    FlowRunFailedException,
     JobCancelledException,
     JobFailedException,
     NotSignedInError,
@@ -65,6 +67,8 @@
     "Server",
     "Pager",
     "FailedSignInError",
+    "FlowRunCancelledException",
+    "FlowRunFailedException",
     "JobCancelledException",
     "JobFailedException",
     "NotSignedInError",

test/test_import_surface.py

@@ -0,0 +1,16 @@
+import tableauserverclient as TSC
+from tableauserverclient.server.endpoint import exceptions
+
+
+def test_job_exceptions_at_top_level():
+    assert TSC.JobFailedException is exceptions.JobFailedException
+    assert TSC.JobCancelledException is exceptions.JobCancelledException
+    assert "JobFailedException" in TSC.__all__
+    assert "JobCancelledException" in TSC.__all__
+
+
+def test_flow_run_exceptions_at_top_level():
+    assert TSC.FlowRunFailedException is exceptions.FlowRunFailedException
+    assert TSC.FlowRunCancelledException is exceptions.FlowRunCancelledException
+    assert "FlowRunFailedException" in TSC.__all__
+    assert "FlowRunCancelledException" in TSC.__all__