Explicitly use localkube bootstrapper and binary

[r2d4]

Use the localkube binary built from CI in the integration tests.

Needed since #2089

[codecov-io]

Codecov Report

Merging #2101 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2101      +/-   ##
==========================================
+ Coverage   28.76%   28.76%   +<.01%     
==========================================
  Files          81       81              
  Lines        5322     5325       +3     
==========================================
+ Hits         1531     1532       +1     
- Misses       3598     3599       +1     
- Partials      193      194       +1

Impacted Files	Coverage Δ
...inikube/kubernetes_versions/kubernetes_versions.go	65.3% <0%> (-4.26%)	⬇️
pkg/util/kubeconfig/config.go	47.61% <0%> (+0.68%)	⬆️

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