[7.17](backport #39295) Deploy/K8S pipeline post-migration fixes

[mergify]

Proposed commit message

In scope of https://github.com/elastic/ingest-dev/issues/3254 - updated deploy/kubernetes pipeline to match same steps & commands as in Jenkins.
Jenkins vs. Buildkite comparison: https://gist.github.com/oakrizan/2e14c620238034d1e6e4f16b9f0fbdb6
BK builds: https://buildkite.com/elastic/deploy-k8s/builds?branch=elastic%3Amergify%2Fbp%2F7.17%2Fpr-39295

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

• [ ]

How to test this PR locally

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---

This is an automatic backport of pull request #39295 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 8664cae has failed:

On branch mergify/bp/7.17/pr-39295
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit 8664cae202.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	deleted:    .buildkite/deploy/kubernetes/scripts/install-kind.sh
	deleted:    .buildkite/deploy/kubernetes/scripts/install-kubectl.sh
	deleted:    .buildkite/deploy/kubernetes/scripts/make.sh
	modified:   .buildkite/deploy/kubernetes/scripts/setup-k8s-env.sh
	modified:   .buildkite/env-scripts/env.sh
	modified:   .buildkite/env-scripts/util.sh
	modified:   .buildkite/hooks/pre-command
	modified:   .buildkite/hooks/scripts/util.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .buildkite/deploy/kubernetes/deploy-k8s-pipeline.yml
	both modified:   .buildkite/scripts/setenv.sh

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[oakrizan]

/test

[dliappis]

LGTM