Improve error handling in worker manager

[AlyssaCote]

This PR aims to allow the WorkerManager to continue if a worker throws an error. The WorkerManager needs to return a Response without blowing up in the process.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (mli-feature@eace71e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
smartsim/_core/mli/infrastructure/worker/worker.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             mli-feature     #629   +/-   ##
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  Coverage               ?   65.62%           
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  Files                  ?       97           
  Lines                  ?     6699           
  Branches               ?        0           
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  Hits                   ?     4396           
  Misses                 ?     2303           
  Partials               ?        0           

Files with missing lines	Coverage Δ
smartsim/_core/mli/message_handler.py	75.82% <ø> (ø)
smartsim/_core/mli/infrastructure/worker/worker.py	79.01% <0.00%> (ø)

[mellis13]

Just a couple of questions/comments

[ankona]

LGTM!