ParlAI Assignment Fixes pt 2

[JackUrb]

Following #875, there's now the condition where too many assignments are being launched. While usually harmless to have this redundancy, it introduced a new race conditions where two threads could be launched for a single assignment. Having two assignment threads for the same assignment, being not ideal, is now patched.

Also bumps hydra in-line with the new expectations as of #869.

[codecov-commenter]

Codecov Report

Merging #878 (1a293af) into main (f1b6766) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #878      +/-   ##
==========================================
+ Coverage   64.45%   64.49%   +0.04%     
==========================================
  Files         108      108              
  Lines        9311     9312       +1     
==========================================
+ Hits         6001     6006       +5     
+ Misses       3310     3306       -4     

Impacted Files	Coverage Δ
.../blueprints/parlai_chat/parlai_chat_agent_state.py	29.03% <ø> (+0.46%)	⬆️
mephisto/utils/metrics.py	29.10% <0.00%> (-0.22%)	⬇️
...ractions/blueprints/mixins/screen_task_required.py	74.74% <0.00%> (+0.25%)	⬆️
mephisto/abstractions/architects/mock_architect.py	90.84% <0.00%> (+2.61%)	⬆️

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[chiehminwei]

Under what condition would this not be true? When things haven't synced to the worker threads?

[JackUrb]

When two workers connect at the same time, and both have had an _assign_unit_to_agent thread called, and have thus both had Agents created, but only one of those threads has made it to the update_status call.