register: Include web-public streams in "streams" field of response.

The "streams" field in "/register" response did not include web-public
streams for non-admin users but the data for those are eventually
included in the subscriptions data sent using "subscriptions",
"unsubscribed" and "never_subscribed" fields.

This commit adds code to include the web-public streams in "streams"
field as well as everyone can access those and will make the "streams"
data complete.

api_docs/changelog.md

@@ -20,6 +20,11 @@ format used by the Zulip server that they are interacting with.
 
 ## Changes in Zulip 8.0
 
+**Feature level 205**
+
+* [`POST /register`](/api/register-queue): `streams` field in the response
+  now included web-public streams as well.
+
 **Feature level 204**
 
 * [`POST /register`](/api/register-queue): Added

zerver/lib/events.py

@@ -572,7 +572,9 @@ def fetch_initial_state_data(
         # places.
         if user_profile is not None:
             state["streams"] = do_get_streams(
-                user_profile, include_all_active=user_profile.is_realm_admin
+                user_profile,
+                include_web_public=True,
+                include_all_active=user_profile.is_realm_admin,
             )
         else:
             # TODO: This line isn't used by the web app because it
@@ -895,7 +897,9 @@ def apply_event(
 
                     if "streams" in state:
                         state["streams"] = do_get_streams(
-                            user_profile, include_all_active=user_profile.is_realm_admin
+                            user_profile,
+                            include_web_public=True,
+                            include_all_active=user_profile.is_realm_admin,
                         )
 
                     if state["is_guest"]:

zerver/openapi/zulip.yaml

@@ -11804,6 +11804,9 @@ paths:
 
                           For organization administrators, this will include all private streams
                           in the organization.
+
+                          **Changes**: As of Zulip 8.0 (feature level 205), this will include all
+                          web-public streams in the organization as well.
                       realm_default_streams:
                         type: array
                         items: