Fail rename_and_wait_for_completion in case the rename_host job failed

So far the wait polling just ended without any follow-up check on the
success of the action.

The rename operation is a complex task which involves multiple actions
on the central and remote site. This is not a transaction which can be
rolled back. So a rename operation may actually be applied partially,
which is unfortunate. But this is the way it is right now.

We now want at least better error reporting about the failed job to
understand error situations easier.

CMK-20848

Change-Id: Ia443107dc6d0f6f20d414a62aecb88f3cc051432

tests/testlib/openapi_session.py

@@ -119,6 +119,7 @@ def __init__(
         self.rulesets = RulesetsAPI(self)
         self.broker_connections = BrokerConnectionsAPI(self)
         self.sites = SitesAPI(self)
+        self.background_jobs = BackgroundJobsAPI(self)
 
     def set_authentication_header(self, user: str, password: str) -> None:
         self.headers["Authorization"] = f"Bearer {user} {password}"
@@ -734,6 +735,11 @@ def rename_and_wait_for_completion(
                 self.get(hostname_new) is not None
             ), 'Failed to rename host "{hostname_old}" to "{hostname_new}"!'
 
+        response = self.session.background_jobs.show("rename-hosts")
+        assert (
+            response["extensions"]["status"]["state"] == "finished"
+        ), f"Rename job failed: {response}"
+
 
 class HostGroupsAPI(BaseAPI):
     def create(self, name: str, alias: str) -> requests.Response:
@@ -1108,3 +1114,19 @@ def login(self, site_id: str, user: str = "cmkadmin", password: str = "cmk") ->
 
         if response.status_code != 204:
             raise UnexpectedResponse.from_response(response)
+
+
+class BackgroundJobsAPI(BaseAPI):
+    def show(self, job_id: str) -> dict[str, Any]:
+        response = self.session.get(
+            f"/objects/background_job/{job_id}",
+            headers={
+                "Content-Type": "application/json",
+            },
+        )
+
+        if response.status_code != 200:
+            raise UnexpectedResponse.from_response(response)
+
+        value: dict[str, Any] = response.json()
+        return value