fix(coderd): remove deprecated AITaskSidebarApp column (#20680)

This column was no longer used in `v2.28` and the codersdk field
deprecated. Both can now be dropped in `v2.29`.

Closes coder/internal#974

coderd/database/migrations/000395_drop_ai_task_sidebar_app_id_from_workspace_builds.down.sql

@@ -0,0 +1,45 @@
+ALTER TABLE workspace_builds ADD COLUMN ai_task_sidebar_app_id UUID;
+ALTER TABLE workspace_builds ADD CONSTRAINT workspace_builds_ai_task_sidebar_app_id_fkey FOREIGN KEY (ai_task_sidebar_app_id) REFERENCES workspace_apps(id);
+
+DROP VIEW workspace_build_with_user;
+-- Restore view.
+CREATE VIEW workspace_build_with_user AS
+SELECT
+    workspace_builds.id,
+    workspace_builds.created_at,
+    workspace_builds.updated_at,
+    workspace_builds.workspace_id,
+    workspace_builds.template_version_id,
+    workspace_builds.build_number,
+    workspace_builds.transition,
+    workspace_builds.initiator_id,
+    workspace_builds.provisioner_state,
+    workspace_builds.job_id,
+    workspace_builds.deadline,
+    workspace_builds.reason,
+    workspace_builds.daily_cost,
+    workspace_builds.max_deadline,
+    workspace_builds.template_version_preset_id,
+    workspace_builds.has_ai_task,
+    workspace_builds.ai_task_sidebar_app_id,
+    workspace_builds.has_external_agent,
+    COALESCE(
+        visible_users.avatar_url,
+        '' :: text
+    ) AS initiator_by_avatar_url,
+    COALESCE(
+        visible_users.username,
+        '' :: text
+    ) AS initiator_by_username,
+    COALESCE(visible_users.name, '' :: text) AS initiator_by_name
+FROM
+    (
+        workspace_builds
+        LEFT JOIN visible_users ON (
+            (
+                workspace_builds.initiator_id = visible_users.id
+            )
+        )
+    );
+
+COMMENT ON VIEW workspace_build_with_user IS 'Joins in the username + avatar url of the initiated by user.';

coderd/database/migrations/000395_drop_ai_task_sidebar_app_id_from_workspace_builds.up.sql

@@ -0,0 +1,43 @@
+-- We're dropping the ai_task_sidebar_app_id column.
+DROP VIEW workspace_build_with_user;
+CREATE VIEW workspace_build_with_user AS
+SELECT
+    workspace_builds.id,
+    workspace_builds.created_at,
+    workspace_builds.updated_at,
+    workspace_builds.workspace_id,
+    workspace_builds.template_version_id,
+    workspace_builds.build_number,
+    workspace_builds.transition,
+    workspace_builds.initiator_id,
+    workspace_builds.provisioner_state,
+    workspace_builds.job_id,
+    workspace_builds.deadline,
+    workspace_builds.reason,
+    workspace_builds.daily_cost,
+    workspace_builds.max_deadline,
+    workspace_builds.template_version_preset_id,
+    workspace_builds.has_ai_task,
+    workspace_builds.has_external_agent,
+    COALESCE(
+        visible_users.avatar_url,
+        '' :: text
+    ) AS initiator_by_avatar_url,
+    COALESCE(
+        visible_users.username,
+        '' :: text
+    ) AS initiator_by_username,
+    COALESCE(visible_users.name, '' :: text) AS initiator_by_name
+FROM
+    (
+        workspace_builds
+        LEFT JOIN visible_users ON (
+            (
+                workspace_builds.initiator_id = visible_users.id
+            )
+        )
+    );
+
+COMMENT ON VIEW workspace_build_with_user IS 'Joins in the username + avatar url of the initiated by user.';
+
+ALTER TABLE workspace_builds DROP COLUMN ai_task_sidebar_app_id;