Display syncStatus, cursor and lastChecked for local KB admin External data sources

Purpose:

Enable administrators to easily see the current status of an external data source

Summary
Add a status display to the Settings -> Local KB Admin -> External data sources display (see subtask for creating this component)

Header

• Synchronization status. Property: syncStatus

Other data in display

• Label: Cursor. Property: cursor
• Label: Last checked. Property: lastChecked, converted from epoch milliseconds to yyyy-MM-ddThh:mm:ssZ (UTC)

Wireframe

User story statement(s):

As a ERM / library system administrator,
I want to check the status of an external data source 
so that I can more easily understand if there is a problem with the data source

Scenarios:

1. Scenario:
   • Given Settings -> Local KB Admin -> External data sources screen
   • When I view external data sources
   • Then I can see the syncStatus, cursor and lastChecked values for the source
2. Scenario:
   • Given a external data source with a sync status
   • When I view the external data source in the settings
   • Then I see the sync status displayed
3. Scenario:
   • Given a external data source without a sync status
   • When I view the external data source in the settings
   • Then I see the sync status label but no value displayed (and aria "No value set")
4. Scenario:
   • Given a external data source with a cursor
   • When I view the external data source in the settings
   • Then I see the value of the cursor displayed
5. Scenario:
   • Given a external data source without a cursor
   • When I view the external data source in the settings
   • Then I see the Cursor label but no value displayed (and aria "No value set")
6. Scenario:
   • Given a external data source with a last checked timestamp
   • When I view the external data source in the settings
   • Then I see the value of the lastChecked timestamp displayed as yyyy-MM-ddThh:mm:ssZ (UTC)
7. Scenario:
   • Given a external data source without a last checked timestamp
   • When I view the external data source in the settings
   • Then I see the Last checked label but no value displayed (and aria "No value set")