refactor,fix: add rename lfs objects migration

[aymanbagabas]

Rename lfs objects from OID[:2]/OID[2:4]/OID[4:] to OID[:2]/OID[2:4]/OID to follow specs https://github.com/git-lfs/git-lfs/blob/main/docs/spec.md#intercepting-git

[codecov]

Codecov Report

Attention: 3824 lines in your changes are missing coverage. Please review.

Comparison is base (050a0d1) 50.52% compared to head (840417d) 47.66%.
Report is 71 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #409      +/-   ##
==========================================
- Coverage   50.52%   47.66%   -2.87%     
==========================================
  Files         107      154      +47     
  Lines        8209    13044    +4835     
==========================================
+ Hits         4148     6218    +2070     
- Misses       3767     6338    +2571     
- Partials      294      488     +194     

Files	Coverage Δ
git/commit.go	42.85% <100.00%> (+17.85%)	⬆️
git/reference.go	40.00% <100.00%> (+7.85%)	⬆️
pkg/backend/backend.go	100.00% <100.00%> (ø)
pkg/backend/cache.go	68.75% <ø> (ø)
pkg/backend/context.go	85.71% <ø> (ø)
pkg/backend/settings.go	78.57% <ø> (ø)
pkg/config/config.go	80.87% <100.00%> (ø)
pkg/config/file.go	100.00% <ø> (ø)
pkg/config/ssh.go	100.00% <100.00%> (ø)
pkg/cron/cron.go	90.00% <100.00%> (ø)
... and 141 more

... and 1 file with indirect coverage changes

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