Use an existing function to calculate offset

[ubaskota]

Issue #, if available:

Description of changes:
Use the existing _get_provider_offset function to calculate offset in insert_before operation.

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.57%. Comparing base (ee748e4) to head (483f285).
⚠️ Report is 170 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3698      +/-   ##
===========================================
- Coverage    92.59%   92.57%   -0.03%     
===========================================
  Files           68       68              
  Lines        15634    15764     +130     
===========================================
+ Hits         14477    14594     +117     
- Misses        1157     1170      +13     

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[arandito]