Enhance error message feed for missing details

[daniele-mng]

What

• When feed owner is missing, the error message is more detailed.

Why

• Previous error message was not detailed for the user.

References

GEA-639

Checklist

• Tests

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA f4393fb.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Files

[github-actions]

Conventional Commits Report

Type	Number
Added	3
Bug Fixes	1

🚀 Conventional commits found.

[codecov]

Codecov Report

Attention: Patch coverage is 86.23853% with 15 lines in your changes missing coverage. Please review.

Project coverage is 64.35%. Comparing base (e71a454) to head (f4393fb).
Report is 9 commits behind head on opensight-ui.

Files with missing lines	Patch %	Lines
src/gmp/http/http.js	75.67%	9 Missing ⚠️
src/gmp/commands/feedstatus.js	91.66%	3 Missing ⚠️
allowedSnakeCase.cjs	0.00%	2 Missing ⚠️
src/web/authorized.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           opensight-ui    #4183      +/-   ##
================================================
+ Coverage         64.31%   64.35%   +0.03%     
================================================
  Files              1111     1111              
  Lines            103884   103977      +93     
  Branches           6479     6496      +17     
================================================
+ Hits              66816    66917     +101     
+ Misses            36929    36921       -8     
  Partials            139      139              

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