[16.0][MIG] cmis_mail

[ThomasBinsfeld]

Reopening of #186 with some fixes

[codecov-commenter]

Codecov Report

❌ Patch coverage is 31.81818% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.42%. Comparing base (c6c1822) to head (9f518f1).
⚠️ Report is 22 commits behind head on 16.0.

Files with missing lines	Patch %	Lines
cmis_mail/wizards/mail_compose_message.py	30.55%	75 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             16.0     #197       +/-   ##
===========================================
- Coverage   86.71%   70.42%   -16.29%     
===========================================
  Files          33       56       +23     
  Lines        1061     1545      +484     
  Branches      124      164       +40     
===========================================
+ Hits          920     1088      +168     
- Misses        117      436      +319     
+ Partials       24       21        -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[FrancoMaxime]

LGTM: code review