feat: add queue_position and queue_size to provisioner jobs (#8074)

coderd/database/queries/provisionerjobs.sql

@@ -47,6 +47,38 @@ FROM
 WHERE
 	id = ANY(@ids :: uuid [ ]);
 
+-- name: GetProvisionerJobsByIDsWithQueuePosition :many
+WITH unstarted_jobs AS (
+    SELECT
+        id, created_at
+    FROM
+        provisioner_jobs
+    WHERE
+        started_at IS NULL
+),
+queue_position AS (
+    SELECT
+        id,
+        ROW_NUMBER() OVER (ORDER BY created_at ASC) AS queue_position
+    FROM
+        unstarted_jobs
+),
+queue_size AS (
+	SELECT COUNT(*) as count FROM unstarted_jobs
+)
+SELECT
+	sqlc.embed(pj),
+    COALESCE(qp.queue_position, 0) AS queue_position,
+    COALESCE(qs.count, 0) AS queue_size
+FROM
+	provisioner_jobs pj
+LEFT JOIN
+	queue_position qp ON qp.id = pj.id
+LEFT JOIN
+	queue_size qs ON TRUE
+WHERE
+	pj.id = ANY(@ids :: uuid [ ]);
+
 -- name: GetProvisionerJobsCreatedAfter :many
 SELECT * FROM provisioner_jobs WHERE created_at > $1;