[WIP][ADD] coopiteasy subscription support followup

[robinkeunen]

Description

Odoo task (if applicable)

Checklist before approval

• Tests are present (or not needed).
• Credits/copyright have been changed correctly.
• Change log snippet is present.
• (If a new module) Moving this to OCA has been considered.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.12%. Comparing base (3f4dca5) to head (969968b).
⚠️ Report is 88 commits behind head on 12.0.
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Additional details and impacted files

@@            Coverage Diff             @@
##             12.0     #108      +/-   ##
==========================================
+ Coverage   78.70%   79.12%   +0.41%     
==========================================
  Files          80       83       +3     
  Lines         803      819      +16     
  Branches      138      141       +3     
==========================================
+ Hits          632      648      +16     
  Misses        152      152              
  Partials       19       19              

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