[IMP] account_perf_obligation_contract - use service dates for performance obligations dates

[baimont]

depends on OCA/contract#1461

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.60%. Comparing base (3e2ea66) to head (61db3f8).
⚠️ Report is 3 commits behind head on 18.0.

Files with missing lines	Patch %	Lines
...t_perf_obligation_contract/models/contract_line.py	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             18.0      #68      +/-   ##
==========================================
+ Coverage   97.58%   97.60%   +0.01%     
==========================================
  Files          63       63              
  Lines        2651     2668      +17     
  Branches      145      145              
==========================================
+ Hits         2587     2604      +17     
  Misses         37       37              
  Partials       27       27              

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[sbidoul]

Ok for me but we need contract_service_dates to be merged in OCA before this one, otherwise we can't move the repo to OCA.