[frontend/backend] Add quick actions on Assignee/Participant (#4333)

[frapuks]

Proposed changes

• Design update of Assignee/Participant chip
• Add quick button on Assignee/Participant to open a drawer to easily add a user
• Display first the current user in the dropdown list
• Display a - when you don't have labels
• Uniformized spacing on Assignee/Participant/Labels with other components

Related issues

• close 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

[Archidoit]

Missing a 'S' in 'Add new Participant' (to be consistant with 'Add new labels' and 'Add new attributes' :

(maybe also the Upper case to be consistant with 'Add new labels') :

Same for Assignee(s) / Participant(s) in the text field --> Assignees / Participants (to be consistant with 'Labels')

[Archidoit]

Behavior tested, working well

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release/6.4.0@f192686). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release/6.4.0    #8513   +/-   ##
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  Files                    ?      606           
  Lines                    ?    60900           
  Branches                 ?     6240           
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  Hits                     ?    40250           
  Misses                   ?    20650           
  Partials                 ?        0           

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[marieflorescontact]

looks good 👌