feat(coderd): add times_used to coder_apps in insights API (#13292)

For now, only applied to `coder_app`s, same logic can be implemented for
VS Code, SSH, etc.

Part of #13099

coderd/insights.go

@@ -543,6 +543,7 @@ func convertTemplateInsightsApps(usage database.GetTemplateInsightsRow, appUsage
 			Slug:        app.Slug,
 			Icon:        app.Icon,
 			Seconds:     app.UsageSeconds,
+			TimesUsed:   app.TimesUsed,
 		})
 	}