Revert "[GOBBLIN-2223] Optimise writing of serialised Work Unit to File system"

[thisisArjit]

Reverts #4133

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.89%. Comparing base (26b3b77) to head (fe62186).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4138      +/-   ##
============================================
+ Coverage     42.81%   42.89%   +0.08%     
- Complexity     2480     2484       +4     
============================================
  Files           513      513              
  Lines         21744    21744              
  Branches       2478     2478              
============================================
+ Hits           9309     9328      +19     
+ Misses        11481    11463      -18     
+ Partials        954      953       -1     

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