fix(partner): Remove legacy contract check

[shadrak98]

• Remove redundant code block from Invoice
• Fetch certificate count of partner

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 38.30%. Comparing base (4a5731e) to head (3a6a6fa).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
press/api/partner.py	0.00%	3 Missing ⚠️
press/press/doctype/team/team.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2441      +/-   ##
==========================================
- Coverage   38.34%   38.30%   -0.05%     
==========================================
  Files         378      379       +1     
  Lines       29738    29784      +46     
==========================================
+ Hits        11404    11409       +5     
- Misses      18334    18375      +41     

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