Update module github.com/giantswarm/clustertest to v0.19.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/giantswarm/clustertest	v0.18.0 -> v0.19.0

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Release Notes

giantswarm/clustertest (github.com/giantswarm/clustertest)

v0.19.0

Compare Source

Changed

• Better log message for app status
• Improve error message when E2E_KUBECONFIG points to a non-existing file
• Show finalizers if object still exists
• Do not unnecessarily allocate TTY for running commands, return stderr content even if command fails with error exit code

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