[backend/frontend] fix: documents for atomic testings (#3956)

[damgouj]

Proposed changes

• Fix documents for atomic testings (Back CRUD and Front bugs)

Testing Instructions

1. Create an atomic testing "mail"
2. Manage documents in it (add, update, remove,...)
3. Execute the atomic test and check if you have documents attached in the mail received
4. Relaunch the atomic testing and check like step 3.

Related issues

• Closes Error 500 when relaunching Atomic testing / send individual mails with Attachment #3956

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.10%. Comparing base (5cf27f1) to head (aff068a).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../java/io/openaev/service/AtomicTestingService.java	87.50%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4394      +/-   ##
============================================
+ Coverage     49.87%   50.10%   +0.22%     
- Complexity     3612     3625      +13     
============================================
  Files           888      888              
  Lines         26491    26494       +3     
  Branches       1984     1986       +2     
============================================
+ Hits          13213    13275      +62     
+ Misses        12487    12426      -61     
- Partials        791      793       +2     

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[gabriel-peze]

Tested ok, but is it possible to add some test to avoid the decrease of test coverage ?