Write estimates even on abort to provide partial estimation of tx writeset

[udpatil]

Describe your changes and provide context

This writes estimated writeset for txs that end up aborting such that later txs can also refer to the writesets that the aborted tx wrote prior to aborting.

Testing performed to validate your change

Tested unit test where all txs accesses same key for maximal abort without and with the optimization (1000txs - 100 runs total time)

Without optimization:

--- PASS: TestProcessAll (10.35s)
    --- PASS: TestProcessAll/Test_every_tx_accesses_same_key (10.34s)

With optimization:

--- PASS: TestProcessAll (5.06s)
    --- PASS: TestProcessAll/Test_every_tx_accesses_same_key (5.06s)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.47%. Comparing base (a21d2bb) to head (010783d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #455      +/-   ##
==========================================
+ Coverage   55.46%   55.47%   +0.01%     
==========================================
  Files         629      629              
  Lines       53523    53526       +3     
==========================================
+ Hits        29686    29695       +9     
+ Misses      21726    21720       -6     
  Partials     2111     2111              

Files	Coverage Δ
tasks/scheduler.go	93.40% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes