Fix sanitize removing polymorphic relations

[alexandrebodin]

Fix sanitize removing polymorphic relations.

Fix #9308

[derrickmehaffy]

Tested with v3.4.5, there is a bit of nested population but we can fix that later as it's too complex to fix right now.

[derrickmehaffy]

LGTM

[codecov]

Codecov Report

Merging #9310 (62d6cb5) into master (afaf111) will increase coverage by 0.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #9310      +/-   ##
==========================================
+ Coverage   35.07%   35.12%   +0.04%     
==========================================
  Files        1308     1310       +2     
  Lines       14465    14535      +70     
  Branches     1439     1453      +14     
==========================================
+ Hits         5074     5105      +31     
- Misses       8481     8514      +33     
- Partials      910      916       +6     

Flag	Coverage Δ
front	26.65% <ø> (ø)
unit	54.71% <75.00%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...anager/admin/src/components/SelectWrapper/index.js	0.00% <ø> (ø)
packages/strapi-utils/lib/sanitize-entity.js	97.10% <71.42%> (-2.90%)	⬇️
packages/strapi/lib/middlewares/session/index.js	39.28% <100.00%> (ø)
...rapi/lib/core/app-configuration/config-provider.js	70.00% <0.00%> (ø)

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[derrickmehaffy]

This pull request has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/new-release-strapi-v3-4-6/2631/1