Bugfixes

[jacob-williamson]

Bugs:

• After restoring contents after a failed _sync, self._queue was pointing to the same object as self._last_good_contents["queue"] same for queue_history etc. This meant that self._last_good_contents from then on changed whenever self._queue changed, defeating its whole purpose. Fixed by doing a deepcopy
• i15-1: The queue converter now expects experiment definitions to have a time_per_pdf field, but the background scans inserted by the plugin didn't populate this field. Have added this in based on the max time_per_pdf in the queue, and a test that would have caught this

Also adds some more logging that was helpful when debugging the above

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.88%. Comparing base (28e8839) to head (8ae0bd8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   98.87%   98.88%           
=======================================
  Files          20       20           
  Lines         976      984    +8     
=======================================
+ Hits          965      973    +8     
  Misses         11       11           

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