ci: skip e2es if no GOOGLE_APPLICATION_CREDENTIALS set

[czeslavo]

Should solve #547.

[codecov-commenter]

Codecov Report

Base: 53.73% // Head: 53.63% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (96f7ada) compared to base (5e7d22e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
- Coverage   53.73%   53.63%   -0.11%     
==========================================
  Files          50       50              
  Lines        3904     3904              
==========================================
- Hits         2098     2094       -4     
- Misses       1546     1550       +4     
  Partials      260      260              

Flag	Coverage Δ
integration-test	58.58% <ø> (-0.12%)	⬇️
unit-test	3.27% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/clusters/utils.go	50.20% <0.00%> (-1.66%)	⬇️

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