Add periodic retry mechanism in the Golden Ticket Fetch

[jairajdev]

Currently, the validator fetches the Golden Ticket from the GT server only once during startup. If the GT server is unresponsive or temporarily down, the validator fails to retrieve it, causing the node to get stuck in standby mode.

Add a periodic retry mechanism for fetching the Golden Ticket so the validator can automatically retrieve it once the GT server becomes available again and successfully join the network.

The retry interval should be configurable and default to 1 hour.

[osyed]

Looks good. Maybe the default retry interval should be shorter; like 10 minutes.