[frontend/backend] Add new markings to max_shareable_markings of groups with auto_new_marking (#7944)

[Archidoit]

Proposed changes

• New marking should be automatically added to max_shareable_markings of the groups with auto_new_marking = true
• UI fixes for max shareable markings in Group overview and group edition form
• Add tests for group with auto_new_marking = true

Related issues

#7944

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.72%. Comparing base (d3a85de) to head (fb67643).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9076      +/-   ##
==========================================
+ Coverage   64.68%   64.72%   +0.03%     
==========================================
  Files         620      620              
  Lines       59208    59231      +23     
  Branches     6520     6532      +12     
==========================================
+ Hits        38301    38335      +34     
+ Misses      20907    20896      -11     

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[lndrtrbn]

When I create a new marking with lower order than a one a group already has on max sharing, it still replaces the existing one

[Archidoit]

When I create a new marking with lower order than a one a group already has on max sharing, it still replaces the existing one

fixed :)