Use size diff from root ref

[Hitenjain14]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 14.79%. Comparing base (e5018a7) to head (16e6dd0).
Report is 93 commits behind head on staging.

Files	Patch %	Lines
...et/blobbercore/handler/object_operation_handler.go	0.00%	21 Missing ⚠️
...ain.net/blobbercore/allocation/allocationchange.go	0.00%	9 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #1460      +/-   ##
===========================================
- Coverage    14.88%   14.79%   -0.10%     
===========================================
  Files          179      180       +1     
  Lines        20222    20218       -4     
===========================================
- Hits          3011     2991      -20     
- Misses       16839    16857      +18     
+ Partials       372      370       -2     

Flag	Coverage Δ
Unit-Tests	14.79% <0.00%> (-0.10%)	⬇️

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