chore: allow tools to be installed with newer versions of go

[ChristopherFry]

This change fixes the example guestbook operator Makefile by allowing the controller-gen and kustomize tools to be successfully installed.

Previously any Make commands requiring one of these tools such as make generate would fail since the go-get-tool function would only download the package with go get however not install the package with go install, where go get no longer installs executables since Go 1.17, https://go.dev/doc/go-get-install-deprecation.

The updated Makefile commands for controller-gen and kustomize aligns with the Makefile kubebuilder generates for new projects, https://github.com/kubernetes-sigs/kubebuilder/blob/master/testdata/project-v3/Makefile.

[k8s-ci-robot]

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[justinsb]

I think we can just go run these now, not sure if that's better though!

[justinsb]

Thanks @ChristopherFry . I've started using go run everywhere rather than trying to install things, there used to be a big performance penalty but I think that penalty is now negligible.

But this simplifies the build scripts, so...

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChristopherFry, justinsb

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