Move data fetching to a single place

[m1kola]

Description

Closes #418

Reviewer Checklist

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

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (9081f96) 83.69% compared to head (2cf102f) 84.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #508      +/-   ##
==========================================
+ Coverage   83.69%   84.11%   +0.41%     
==========================================
  Files          23       23              
  Lines         877      875       -2     
==========================================
+ Hits          734      736       +2     
+ Misses         97       95       -2     
+ Partials       46       44       -2     

Flag	Coverage Δ
e2e	65.82% <82.35%> (+0.60%)	⬆️
unit	78.87% <82.35%> (+0.19%)	⬆️

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

Files	Coverage Δ
...al/resolution/variablesources/bundle_deployment.go	78.94% <100.00%> (+6.22%)	⬆️
...lution/variablesources/bundles_and_dependencies.go	100.00% <100.00%> (+4.00%)	⬆️
...al/resolution/variablesources/installed_package.go	73.91% <100.00%> (+2.48%)	⬆️
internal/resolution/variablesources/operator.go	88.88% <100.00%> (+7.93%)	⬆️
...nal/resolution/variablesources/required_package.go	72.50% <100.00%> (-1.92%)	⬇️
internal/controllers/variable_source.go	72.72% <64.70%> (-27.28%)	⬇️

... and 1 file with indirect coverage changes

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