If agent cancels a workflow we need to report that back to the queue too

[6543]

regression of #6011

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.43%. Comparing base (9f9aa72) to head (9893ca0).

Files with missing lines	Patch %	Lines
server/rpc/rpc.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6262      +/-   ##
==========================================
+ Coverage   32.41%   32.43%   +0.01%     
==========================================
  Files         420      420              
  Lines       28318    28321       +3     
==========================================
+ Hits         9180     9185       +5     
+ Misses      18289    18287       -2     
  Partials      849      849              

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[qwerty287]

Not tested by me