feat(kumactl) install gateway types (backport #1950)

[mergify]

This is an automatic backport of pull request #1950 done by Mergify.
Cherry-pick of 56443c1 has failed:

On branch mergify/bp/release-1.1/pr-1950
Your branch is up to date with 'origin/release-1.1'.

You are currently cherry-picking commit 56443c179.
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Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   app/kumactl/cmd/completion/testdata/zsh.golden
	deleted by us:   app/kumactl/cmd/install/context/install_gateway_context.go
	deleted by us:   app/kumactl/cmd/install/install_gateway.go
	deleted by us:   app/kumactl/cmd/install/install_gateway_test.go

no changes added to commit (use "git add" and/or "git commit -a")

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