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If the scheduler receives an error, it will never restart again since `bgw_restart_time` is set to `BGW_NEVER_RESTART`, which will prevent all jobs from executing. This commit adds the GUC `timescaledb.bgw_scheduler_restart_time` that can be set to the restart time for the scheduler. It defaults to 60 seconds, which is the default restart interval for background workers defined by PostgreSQL. It also adds `timescaledb.debug_bgw_scheduler_exit_status` to be able to shutdown the scheduler with a non-zero exit status, which allows the restart functionality to be tested. It also ensures that `backend_type` is explicitly set up rather than copied from `application_name` and add some more information to `application_name`. It also updates the tests to use `backend_type` where applicable. To avoid exhausting slots when the launcher restarts, it will kill all existing schedulers and start new ones. Since background worker slots are easily exhausted in the `bgw_launcher` test, we do not run it repeatedly in the flakes workflow.