chore(flotilla): Create Result Channel for Task at Submission

[srilman]

Changes Made

Remove some dead / old code as we discussed. Makes the join PR a little less worry-some as well.

Checklist

• Documented in API Docs (if applicable)
• Documented in User Guide (if applicable)
• If adding a new documentation page, doc is added to docs/mkdocs.yml navigation
• Documentation builds and is formatted properly (tag @/ccmao1130 for docs review)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.61%. Comparing base (4661c99) to head (eb1127b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4745      +/-   ##
==========================================
- Coverage   78.62%   78.61%   -0.01%     
==========================================
  Files         875      875              
  Lines      122214   122217       +3     
==========================================
  Hits        96085    96085              
- Misses      26129    26132       +3     

Files with missing lines	Coverage Δ
...ibuted/src/scheduling/scheduler/scheduler_actor.rs	94.46% <100.00%> (+0.01%)	⬆️

... and 8 files with indirect coverage changes

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