[1.4.x] Improve validation for import session (#12492)

[github-actions]

Backport

This will backport the following commits from master to 1.4.x:

• Improve validation for import session (#12492)

Questions ?

Please refer to the Backport tool documentation

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.18%. Comparing base (8ed8c0d) to head (010f4c1).

Additional details and impacted files

@@           Coverage Diff           @@
##            1.4.x   #12495   +/-   ##
=======================================
  Coverage   85.17%   85.18%           
=======================================
  Files        1389     1389           
  Lines       92657    92679   +22     
  Branches    10222    10222           
=======================================
+ Hits        78925    78950   +25     
+ Misses      13671    13668    -3     
  Partials       61       61           

Flag	Coverage Δ
backend	90.72% <66.66%> (+<0.01%)	⬆️

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

Components	Coverage Δ
Backend Apps	89.58% <66.66%> (+<0.01%)	⬆️
Backend General	93.36% <ø> (ø)
Frontend	79.53% <ø> (ø)

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