[frontend] add current user first in assignee/participant field (#4333)

[frapuks]

Proposed changes

• add current user first in assignee/participant field

Related issues

• Quick button to add Assignees and Participants #4333

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

• fix for the 2 cases : If the user is in the only 10 first results returned by the query AND if is not returned

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.33%. Comparing base (3e0f5a7) to head (5f44727).
Report is 1 commits behind head on release/6.4.0.

Additional details and impacted files

@@              Coverage Diff               @@
##           release/6.4.0    #8895   +/-   ##
==============================================
  Coverage          64.33%   64.33%           
==============================================
  Files                608      608           
  Lines              58023    58023           
  Branches            6403     6404    +1     
==============================================
  Hits               37330    37330           
  Misses             20693    20693           

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[Archidoit]

Behavior ok, working well, juste 2 code comments