feat: Add high availability for multiple replicas (#4555)

* feat: HA tailnet coordinator

* fixup! feat: HA tailnet coordinator

* fixup! feat: HA tailnet coordinator

* remove printlns

* close all connections on coordinator

* impelement high availability feature

* fixup! impelement high availability feature

* fixup! impelement high availability feature

* fixup! impelement high availability feature

* fixup! impelement high availability feature

* Add replicas

* Add DERP meshing to arbitrary addresses

* Move packages to highavailability folder

* Move coordinator to high availability package

* Add flags for HA

* Rename to replicasync

* Denest packages for replicas

* Add test for multiple replicas

* Fix coordination test

* Add HA to the helm chart

* Rename function pointer

* Add warnings for HA

* Add the ability to block endpoints

* Add flag to disable P2P connections

* Wow, I made the tests pass

* Add replicas endpoint

* Ensure close kills replica

* Update sql

* Add database latency to high availability

* Pipe TLS to DERP mesh

* Fix DERP mesh with TLS

* Add tests for TLS

* Fix replica sync TLS

* Fix RootCA for replica meshing

* Remove ID from replicasync

* Fix getting certificates for meshing

* Remove excessive locking

* Fix linting

* Store mesh key in the database

* Fix replica key for tests

* Fix types gen

* Fix unlocking unlocked

* Fix race in tests

* Update enterprise/derpmesh/derpmesh.go

Co-authored-by: Colin Adler <colin1adler@gmail.com>

* Rename to syncReplicas

* Reuse http client

* Delete old replicas on a CRON

* Fix race condition in connection tests

* Fix linting

* Fix nil type

* Move pubsub to in-memory for twenty test

* Add comment for configuration tweaking

* Fix leak with transport

* Fix close leak in derpmesh

* Fix race when creating server

* Remove handler update

* Skip test on Windows

* Fix DERP mesh test

* Wrap HTTP handler replacement in mutex

* Fix error message for relay

* Fix API handler for normal tests

* Fix speedtest

* Fix replica resend

* Fix derpmesh send

* Ping async

* Increase wait time of template version jobd

* Fix race when closing replica sync

* Add name to client

* Log the derpmap being used

* Don't connect if DERP is empty

* Improve agent coordinator logging

* Fix lock in coordinator

* Fix relay addr

* Fix race when updating durations

* Fix client publish race

* Run pubsub loop in a queue

* Store agent nodes in order

* Fix coordinator locking

* Check for closed pipe

Co-authored-by: Colin Adler <colin1adler@gmail.com>

coderd/workspaceagents_test.go

@@ -123,13 +123,13 @@ func TestWorkspaceAgentListen(t *testing.T) {
 		defer cancel()
 
 		resources := coderdtest.AwaitWorkspaceAgents(t, client, workspace.ID)
-		conn, err := client.DialWorkspaceAgentTailnet(ctx, slog.Logger{}, resources[0].Agents[0].ID)
+		conn, err := client.DialWorkspaceAgent(ctx, resources[0].Agents[0].ID, nil)
 		require.NoError(t, err)
 		defer func() {
 			_ = conn.Close()
 		}()
 		require.Eventually(t, func() bool {
-			_, err := conn.Ping()
+			_, err := conn.Ping(ctx)
 			return err == nil
 		}, testutil.WaitLong, testutil.IntervalFast)
 	})
@@ -253,7 +253,9 @@ func TestWorkspaceAgentTailnet(t *testing.T) {
 
 	ctx, cancelFunc := context.WithCancel(context.Background())
 	defer cancelFunc()
-	conn, err := client.DialWorkspaceAgentTailnet(ctx, slogtest.Make(t, nil).Named("client").Leveled(slog.LevelDebug), resources[0].Agents[0].ID)
+	conn, err := client.DialWorkspaceAgent(ctx, resources[0].Agents[0].ID, &codersdk.DialWorkspaceAgentOptions{
+		Logger: slogtest.Make(t, nil).Named("client").Leveled(slog.LevelDebug),
+	})
 	require.NoError(t, err)
 	defer conn.Close()
 	sshClient, err := conn.SSHClient()