Calculate heartbeats from database server clock

Current Situation

• The JOC Cockpit Cluster Service writes heartbeats to the database that are used to determine availability of the active JOC Cockpit instance.
• Heartbeats are written to the database using the database server clock. When checking if heartbeats are exceeded then JOC Cockpit compares using its local server clock.
• When the clocks of database server and JOC Cockpit server are not in sync then the JOC Cockpit Dashboard view indicates the connection status to the database being unstable/unhealthy. Users should keep the clocks of their servers in sync.

Desired Behavior

• JOC Cockpit makes use of the database server's clock exclusively when comparing heartbeats. No unstable/unhealthy connection status is reported if the clocks of database server and JOC Cockpit server are not in sync.
• Users should synchronize their servers from a time service as otherwise timestamps displayed will not be accurate.