Support long runs

[johnstairs]

The SAS tokens that we generate only last one hour. We need to support renewing these on the recon side, during tyger buffer read|write.

1. tyger buffer read|write ID should periodically call the endpoint to refresh the token. 2.tyger buffer read PATH should periodically re-read the file with the SAS URL.
2. Tyger server should update all active Kubernetes run secrets with updated SAS URLs every 15 or 30 minutes.