[12.x] Display oldest pending job in queue:monitor output

[jackbayliss]

This was only available in the json output when using --json

This PR ensures its shown in the output too to align the two, and saves digging in the DB / useful when you're doing multiple queue names at once.

Before:

php artisan queue:monitor default

  Queue name ......................................................................................................................... Size / Status  
  [database] default ........................................................................................................................ [1] OK  
  Pending jobs ................................................................................................................................... 1  
  Delayed jobs ................................................................................................................................... 0  
  Reserved jobs .................................................................................................................................. 0  
  
 php artisan queue:monitor default --json
// This shows oldest pending...
[{"connection":"database","queue":"default","size":1,"pending":1,"delayed":0,"reserved":0,"oldest_pending":1741042884,"status":"OK"}]

After:

php artisan queue:monitor default

  Queue name ......................................................................................................................... Size / Status  
  [database] default ........................................................................................................................ [1] OK  
  Pending jobs ................................................................................................................................... 1  
  Delayed jobs ................................................................................................................................... 0  
  Reserved jobs .................................................................................................................................. 0  
  Oldest pending job .................................................................................................................... 1 year ago

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[jackbayliss]

Tests are failing which will be resolved in #59068 - but nothing to do with this PR so good for review 🫡