fix: Helm name in repo details

[chansuke]

Closes #23239

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[olivergondza]

@chansuke, please check this fix also addresses:

• Using .repo.GetAppDetails).Helm.Name returns empty string #15998
• repo.GetAppDetails doesn't return all parameters, values etc. of the specific app #13171

[olivergondza]

Please add/update relevant tests.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.85%. Comparing base (1b973b8) to head (2e05dab).

Files with missing lines	Patch %	Lines
reposerver/repository/repository.go	57.14%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #23262      +/-   ##
==========================================
+ Coverage   60.80%   60.85%   +0.05%     
==========================================
  Files         404      404              
  Lines       66217    66231      +14     
==========================================
+ Hits        40261    40305      +44     
+ Misses      22712    22687      -25     
+ Partials     3244     3239       -5     

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[chansuke]

@olivergondza
Thank you so much for your comment. I added the tests.