Add tlBMC route handling for TH Managed Service restart time This adds tlBMC parsing and surfaces the Restart Time metric for TH managed services. This metric indicates the difference between the `ActiveEnterTimestamp - InactiveEnterTimestamp`, which is the effective downtime of a service after TH package has been installed. #tlbmc PiperOrigin-RevId: 847876251 Change-Id: Id5d3a20b400f903e379871845580687dcd2dea62