Improvements for data import

[SchrodingersGat]

• Do not double migrate if no plugin data imported
• Prevent settings write on a settings read

[netlify]

✅ Deploy Preview for inventree-web-pui-preview canceled.

Name	Link
🔨 Latest commit	1eb4d35
🔍 Latest deploy log	https://app.netlify.com/projects/inventree-web-pui-preview/deploys/69d829131aa5750008387988

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.38%. Comparing base (4b3b03e) to head (1eb4d35).
⚠️ Report is 3 commits behind head on master.

❌ Your patch status has failed because the patch coverage (66.66%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11710   +/-   ##
=======================================
  Coverage   91.38%   91.38%           
=======================================
  Files         966      966           
  Lines       50050    50055    +5     
=======================================
+ Hits        45739    45745    +6     
+ Misses       4311     4310    -1     

Flag	Coverage Δ
backend	89.27% <60.00%> (+<0.01%)	⬆️

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

Components	Coverage Δ
Backend Apps	91.73% <ø> (ø)
Backend General	93.39% <66.66%> (-0.02%)	⬇️
Frontend	∅ <ø> (∅)

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