feat: Add buffering to provisioner job logs (#4918)

* feat: Add bufferring to provisioner job logs

This should improve overall build performance, and especially under load.

It removes the old `id` column on the `provisioner_job_logs` table
and replaces it with an auto-incrementing big integer to preserve order.

Funny enough, we never had to care about order before because inserts
would at minimum be 1ms different. Now they aren't, so the order needs
to be preserved.

* Fix log bufferring

* Fix frontend log streaming

* Fix JS test

coderd/database/dump.sql

@@ -272,15 +272,24 @@ CREATE TABLE provisioner_daemons (
 );
 
 CREATE TABLE provisioner_job_logs (
-    id uuid NOT NULL,
     job_id uuid NOT NULL,
     created_at timestamp with time zone NOT NULL,
     source log_source NOT NULL,
     level log_level NOT NULL,
     stage character varying(128) NOT NULL,
-    output character varying(1024) NOT NULL
+    output character varying(1024) NOT NULL,
+    id bigint NOT NULL
 );
 
+CREATE SEQUENCE provisioner_job_logs_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE provisioner_job_logs_id_seq OWNED BY provisioner_job_logs.id;
+
 CREATE TABLE provisioner_jobs (
     id uuid NOT NULL,
     created_at timestamp with time zone NOT NULL,
@@ -463,6 +472,8 @@ CREATE TABLE workspaces (
 
 ALTER TABLE ONLY licenses ALTER COLUMN id SET DEFAULT nextval('licenses_id_seq'::regclass);
 
+ALTER TABLE ONLY provisioner_job_logs ALTER COLUMN id SET DEFAULT nextval('provisioner_job_logs_id_seq'::regclass);
+
 ALTER TABLE ONLY agent_stats
     ADD CONSTRAINT agent_stats_pkey PRIMARY KEY (id);