🌱 Change global var GetInstalledBundle to interface

[bentito]

Description

Follow on to the helm-poc changes:

We'd like to not have a global variable for GetInstalledBundle, but instead an easier to test interface.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.21%. Comparing base (0058054) to head (93b05e0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
- Coverage   77.21%   76.21%   -1.01%     
==========================================
  Files          17       17              
  Lines        1176     1177       +1     
==========================================
- Hits          908      897      -11     
- Misses        189      202      +13     
+ Partials       79       78       -1     

Flag	Coverage Δ
e2e	58.19% <100.00%> (-1.67%)	⬇️
unit	58.02% <50.00%> (-0.51%)	⬇️

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