fix(coderd): workspaceapps: update last_used_at when workspace app reports stats (#11603)

- Adds a new query BatchUpdateLastUsedAt
- Adds calls to BatchUpdateLastUsedAt in app stats handler upon flush
- Passes a stats flush channel to apptest setup scaffolding and updates unit tests to assert modifications to LastUsedAt.

enterprise/coderd/coderdenttest/proxytest.go

@@ -37,6 +37,9 @@ type ProxyOptions struct {
 
 	// ProxyURL is optional
 	ProxyURL *url.URL
+
+	// FlushStats is optional
+	FlushStats chan chan<- struct{}
 }
 
 // NewWorkspaceProxy will configure a wsproxy.Server with the given options.
@@ -113,6 +116,9 @@ func NewWorkspaceProxy(t *testing.T, coderdAPI *coderd.API, owner *codersdk.Clie
 	// Inherit collector options from coderd, but keep the wsproxy reporter.
 	statsCollectorOptions := coderdAPI.Options.WorkspaceAppsStatsCollectorOptions
 	statsCollectorOptions.Reporter = nil
+	if options.FlushStats != nil {
+		statsCollectorOptions.Flush = options.FlushStats
+	}
 
 	wssrv, err := wsproxy.New(ctx, &wsproxy.Options{
 		Logger:            slogtest.Make(t, nil).Leveled(slog.LevelDebug),

enterprise/wsproxy/wsproxy_test.go

@@ -442,6 +442,13 @@ func TestWorkspaceProxyWorkspaceApps(t *testing.T) {
 			"*",
 		}
 
+		proxyStatsCollectorFlushCh := make(chan chan<- struct{}, 1)
+		flushStats := func() {
+			proxyStatsCollectorFlushDone := make(chan struct{}, 1)
+			proxyStatsCollectorFlushCh <- proxyStatsCollectorFlushDone
+			<-proxyStatsCollectorFlushDone
+		}
+
 		client, closer, api, user := coderdenttest.NewWithAPI(t, &coderdenttest.Options{
 			Options: &coderdtest.Options{
 				DeploymentValues:         deploymentValues,
@@ -476,6 +483,7 @@ func TestWorkspaceProxyWorkspaceApps(t *testing.T) {
 			Name:            "best-proxy",
 			AppHostname:     opts.AppHost,
 			DisablePathApps: opts.DisablePathApps,
+			FlushStats:      proxyStatsCollectorFlushCh,
 		})
 
 		return &apptest.Deployment{
@@ -483,6 +491,7 @@ func TestWorkspaceProxyWorkspaceApps(t *testing.T) {
 			SDKClient:      client,
 			FirstUser:      user,
 			PathAppBaseURL: proxyAPI.Options.AccessURL,
+			FlushStats:     flushStats,
 		}
 	})
 }