feat(coderd): add owner-related fields to tasks_with_status view (#20471)

Relates to
https://github.com/coder/coder/pull/20431/files#diff-9cfc826a6ce7e77d977b2025482474dd263d12965b2a94479a74c7f1d872b782

If the workspace relating to a task was deleted, most of the
workspace-related fields in `taskFromDBTaskAndWorkspace` will be
zero-valued. However, we can still get information relating to the owner
so that "created by" shows up correctly in the UI.

Updates the `tasks_with_status` view with a join on `visible_users` to
get owner-related info.

coderd/database/dump.sql

@@ -1828,6 +1828,15 @@ CREATE TABLE tasks (
     deleted_at timestamp with time zone
 );
 
+CREATE VIEW visible_users AS
+ SELECT users.id,
+    users.username,
+    users.name,
+    users.avatar_url
+   FROM users;
+
+COMMENT ON VIEW visible_users IS 'Visible fields of users are allowed to be joined with other tables for including context of other resources.';
+
 CREATE TABLE workspace_agents (
     id uuid NOT NULL,
     created_at timestamp with time zone NOT NULL,
@@ -1978,8 +1987,16 @@ CREATE VIEW tasks_with_status AS
         END AS status,
     task_app.workspace_build_number,
     task_app.workspace_agent_id,
-    task_app.workspace_app_id
-   FROM ((((tasks
+    task_app.workspace_app_id,
+    task_owner.owner_username,
+    task_owner.owner_name,
+    task_owner.owner_avatar_url
+   FROM (((((tasks
+     CROSS JOIN LATERAL ( SELECT vu.username AS owner_username,
+            vu.name AS owner_name,
+            vu.avatar_url AS owner_avatar_url
+           FROM visible_users vu
+          WHERE (vu.id = tasks.owner_id)) task_owner)
      LEFT JOIN LATERAL ( SELECT task_app_1.workspace_build_number,
             task_app_1.workspace_agent_id,
             task_app_1.workspace_app_id
@@ -2210,15 +2227,6 @@ COMMENT ON COLUMN template_versions.external_auth_providers IS 'IDs of External
 
 COMMENT ON COLUMN template_versions.message IS 'Message describing the changes in this version of the template, similar to a Git commit message. Like a commit message, this should be a short, high-level description of the changes in this version of the template. This message is immutable and should not be updated after the fact.';
 
-CREATE VIEW visible_users AS
- SELECT users.id,
-    users.username,
-    users.name,
-    users.avatar_url
-   FROM users;
-
-COMMENT ON VIEW visible_users IS 'Visible fields of users are allowed to be joined with other tables for including context of other resources.';
-
 CREATE VIEW template_version_with_user AS
  SELECT template_versions.id,
     template_versions.template_id,