Draft: Default termination grace period

The default grace period (30 seconds) should be more than enough, otherwise something else has gone wrong, and waiting longer will not help.

Additionally some version of kubernetes may have wrong interpretation this setting. See: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#probe-level-terminationgraceperiodseconds

Therefore it seems best to remove it from the chart.