Fix / Settings nav notifications

[ronronscelestes]

What

Fixed settings nav notifications UI + added test snapshots

#12729

[codecov]

Codecov Report

Merging #12777 (0fb71af) into master (1cb4307) will increase coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 0fb71af differs from pull request most recent head 645e445. Consider uploading reports for the commit 645e445 to get more accurate results

@@            Coverage Diff             @@
##           master   #12777      +/-   ##
==========================================
+ Coverage   47.61%   47.62%   +0.01%     
==========================================
  Files         228      228              
  Lines        8515     8513       -2     
  Branches     1901     1898       -3     
==========================================
  Hits         4054     4054              
+ Misses       3666     3665       -1     
+ Partials      795      794       -1     

Flag	Coverage Δ
front	?
unit	47.62% <0.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
.../content-manager/server/services/entity-manager.js	31.53% <0.00%> (+0.55%)	⬆️

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[HichamELBSI]

LGTM

[MarionLemaire]

Tested on Chrome using Getstarted and admin running on Ubuntu : notification is shown about upgrading Strapi version in Settings section (dot icon after Overview).