feat: expose JobFailedException and JobCancelledException at the top level

Both were previously reachable only via
`tableauserverclient.server.endpoint.exceptions`, which is an internal
module path. Callers waiting on a background job with
`server.jobs.wait_for_job()` need to catch these to distinguish a
failed job from a cancelled one (JobCancelledException is a subclass
of JobFailedException, so the order in an except-chain matters), and
reaching into a `server.endpoint` sub-package to do so is a bad
pattern to teach.

Re-export them alongside the other exception types already exposed at
the top level (FailedSignInError, MissingRequiredFieldError,
NotSignedInError, ServerResponseError). Existing internal imports in
tests and endpoints remain unchanged; this is purely additive.

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

Author: jacalata

tableauserverclient/__init__.py

@@ -67,6 +67,8 @@
     RequestOptions,
     MissingRequiredFieldError,
     FailedSignInError,
+    JobCancelledException,
+    JobFailedException,
     NotSignedInError,
     ServerResponseError,
     Filter,
@@ -105,6 +107,8 @@
     "HourlyInterval",
     "ImageRequestOptions",
     "IntervalItem",
+    "JobCancelledException",
+    "JobFailedException",
     "JobItem",
     "JWTAuth",
     "LinkedTaskFlowRunItem",

tableauserverclient/server/__init__.py

@@ -12,7 +12,12 @@
 from tableauserverclient.server.sort import Sort
 from tableauserverclient.server.server import Server
 from tableauserverclient.server.pager import Pager
-from tableauserverclient.server.endpoint.exceptions import FailedSignInError, NotSignedInError
+from tableauserverclient.server.endpoint.exceptions import (
+    FailedSignInError,
+    JobCancelledException,
+    JobFailedException,
+    NotSignedInError,
+)
 
 from tableauserverclient.server.endpoint import (
     Auth,
@@ -60,6 +65,8 @@
     "Server",
     "Pager",
     "FailedSignInError",
+    "JobCancelledException",
+    "JobFailedException",
     "NotSignedInError",
     "Auth",
     "CustomViews",