Fix "no permission to see this field"

[petersg83]

fix #7232

When a user has several roles, the permissions need to be merged.
I merged the fields attributes.

@HichamELBSI Should we worry about the merge of the conditions ? The merge strategy should be an intersection of all conditions.

[codecov]

Codecov Report

Merging #7517 into master will increase coverage by 0.15%.
The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master    #7517      +/-   ##
==========================================
+ Coverage   26.21%   26.37%   +0.15%     
==========================================
  Files        1131     1131              
  Lines       15440    15448       +8     
  Branches     2438     2442       +4     
==========================================
+ Hits         4048     4074      +26     
+ Misses       9576     9562      -14     
+ Partials     1816     1812       -4     

Flag	Coverage Δ
#front	18.24% <0.00%> (-0.01%)	⬇️
#unit	53.85% <75.00%> (+0.70%)	⬆️

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Impacted Files	Coverage Δ
...rc/containers/EditViewDataManagerProvider/index.js	0.00% <0.00%> (ø)
packages/strapi/lib/core-api/controller.js	23.07% <0.00%> (ø)
packages/strapi-utils/lib/sanitize-entity.js	100.00% <100.00%> (+38.70%)	⬆️

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[soupette]

@petersg83 I think this fix should be made in the back-end instead of the front-end. The back-end should send only one permission for a specific action instead of multiple ones as your fix works for the CM only and not for the plugins. I am closing this PR feel free to reopen it if you think I am making a wrong assumption.