Optimize single release getting

[undera]

Changes Proposed

Used dedicated Helm call to get individual release, instead of scanning full list always.

Check List

• The title of my pull request is a short description of the changes
• This PR relates to some issue: The dashboard DOS attacks the service during initial load #372
• I have documented the changes made (if applicable)
• I have covered the changes with unit tests

[codecov-commenter]

Codecov Report

Patch coverage: 43.75% and project coverage change: +0.27 🎉

Comparison is base (27eb794) 29.82% compared to head (e0dad24) 30.09%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #373      +/-   ##
==========================================
+ Coverage   29.82%   30.09%   +0.27%     
==========================================
  Files          10       10              
  Lines        1321     1329       +8     
==========================================
+ Hits          394      400       +6     
- Misses        888      890       +2     
  Partials       39       39              

Impacted Files	Coverage Δ
pkg/dashboard/objects/releases.go	8.19% <43.75%> (+1.87%)	⬆️

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