test: add helm repo install check

[umagnus]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

/kind feature

What this PR does / why we need it:

test: add helm repo install check

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @umagnus. Thanks for your PR.

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[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, umagnus

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Needs approval from an approver in each of these files:

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[coveralls]

Pull Request Test Coverage Report for Build 3157374764

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.411%

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Totals
Change from base Build 3112665963:	0.0%
Covered Lines:	610
Relevant Lines:	788

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💛 - Coveralls