This relates to this PR girder/girder#3434 on Girder and Grunt version pinning.

This PR became a bit more involved:

• Updated Poetry to latest (1.3.2) because poetry lock files are version dependent and to make dev easier this was done
• Updated girder and girder_jobs to 3.1.16 to fix the Grunt build issue
• This caused an issue where docker couldn't build the container unless girder_worker was also updated so that was updated to the latest version.
• There were some changes in girder_worker which needed to be resolved
  • The worker initialization needed to have a default value 'worker' added to the system. This is the same as in the girder_worker plugin
  • We were previously adding a queue count to the 'job' endpoint and just so happened that the plugin order was allowing us to do this before. I've updated it so that now it manually ensures that the jobs plugin is loaded before adding that additional endpoint.