integrations: Update "stream", "subject" occurrences in Git integration.

The config file is user facing, hence it needs to be updated, for the
integration doc to be updated.

Author: Niloth-p

Diff for: zulip/integrations/git/post-receive

@@ -90,8 +90,8 @@ def send_bot_message(oldrev: str, newrev: str, refname: str) -> None:
 
     message_data = {
         "type": "stream",
-        "to": destination["stream"],
-        "subject": destination["subject"],
+        "to": destination["channel"],
+        "topic": destination["topic"],
         "content": message,
     }
     client.send_message(message_data)

Diff for: zulip/integrations/git/zulip_git_config.py

@@ -1,8 +1,8 @@
 #
 from typing import Dict, Optional
 
-# Name of the stream to send notifications to, default is "commits"
-STREAM_NAME = "commits"
+# Name of the channel to send notifications to, default is "commits"
+CHANNEL_NAME = "commits"
 
 # Change these values to configure authentication for the plugin
 ZULIP_USER = "[email protected]"
@@ -17,16 +17,16 @@
 # * branch = the name of the branch that was pushed to
 # * commit = the commit id
 #
-# Returns a dictionary encoding the stream and subject to send the
+# Returns a dictionary encoding the channel and topic to send the
 # notification to (or None to send no notification).
 #
 # The default code below will send every commit pushed to "main" to
-# * stream "commits"
+# * channel "commits"
 # * topic "main"
 # And similarly for branch "test-post-receive" (for use when testing).
 def commit_notice_destination(repo: str, branch: str, commit: str) -> Optional[Dict[str, str]]:
     if branch in ["main", "master", "test-post-receive"]:
-        return dict(stream=STREAM_NAME, subject=f"{branch}")
+        return dict(channel=CHANNEL_NAME, topic=f"{branch}")
 
     # Return None for cases where you don't want a notice sent
     return None