webhooks/gitlab: Replace "Build Hook" with "Job Hook".

At some point, GitLab decided to change the name of the event for
CI notifications from "Build Hook" to "Job Hook" and we started
running into errors in webhook-logger.log.

zerver/webhooks/gitlab/tests.py

@@ -316,7 +316,7 @@ class GitlabHookTests(WebhookTestCase):
             'build_created',
             expected_subject,
             expected_message,
-            HTTP_X_GITLAB_EVENT="Build Hook"
+            HTTP_X_GITLAB_EVENT="Job Hook"
         )
 
     def test_build_started_event_message(self) -> None:
@@ -327,7 +327,7 @@ class GitlabHookTests(WebhookTestCase):
             'build_started',
             expected_subject,
             expected_message,
-            HTTP_X_GITLAB_EVENT="Build Hook"
+            HTTP_X_GITLAB_EVENT="Job Hook"
         )
 
     def test_build_succeeded_event_message(self) -> None:
@@ -338,7 +338,7 @@ class GitlabHookTests(WebhookTestCase):
             'build_succeeded',
             expected_subject,
             expected_message,
-            HTTP_X_GITLAB_EVENT="Build Hook"
+            HTTP_X_GITLAB_EVENT="Job Hook"
         )
 
     def test_pipeline_succeeded_event_message(self) -> None:

zerver/webhooks/gitlab/view.py

@@ -261,7 +261,7 @@ EVENT_FUNCTION_MAPPER = {
     'Merge Request Hook reopen': partial(get_merge_request_event_body, action='reopened'),
     'Wiki Page Hook create': partial(get_wiki_page_event_body, action='created'),
     'Wiki Page Hook update': partial(get_wiki_page_event_body, action='updated'),
-    'Build Hook': get_build_hook_event_body,
+    'Job Hook': get_build_hook_event_body,
     'Pipeline Hook': get_pipeline_event_body,
 }
 
@@ -286,7 +286,7 @@ def get_body_based_on_event(event: str) -> Any:
 def get_subject_based_on_event(event: str, payload: Dict[str, Any]) -> Text:
     if event == 'Push Hook':
         return u"{} / {}".format(get_repo_name(payload), get_branch_name(payload))
-    elif event == 'Build Hook':
+    elif event == 'Job Hook':
         return u"{} / {}".format(payload['repository'].get('name'), get_branch_name(payload))
     elif event == 'Pipeline Hook':
         return u"{} / {}".format(