chore: build kustomize binary into _output/ directory

[xjohnyknox]

make kustomize currently does go install, putting the binary in $GOBIN. This changes it to use go build -o _output/kustomize instead, keeping the binary in the repo tree like k/k does with _output/bin/.

_output/ gets prepended to PATH so existing make targets that depend on the binary still work. make clean wipes it.

I verified the target resolves correctly and the existing test/e2e targets pick up the binary from the new path.

Fixes #5347

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @xjohnyknox. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[sarab97]

/ok-to-test

[grothej]

Suggested change

	# goreleaser artifacts
	**/dist/
	/output/

Seems like goreleaser isn't used anymore. Looks like it was removed in #5239