use strings instead of custom types when passing to templating

[SimonTheLeg]

This is required since functions like sha3 short expect a string to work properly and not the custom type

Summary

What Type of PR Is This?

/kind bug

Related Issue(s)

Fixes #

Release Notes

Fix: ClusterName and ClusterPath can now be used in conjunction with sha3short template function 

[embik]

/approve

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: embik

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[kcp-ci-bot]

LGTM label has been added.

Git tree hash: b4f8a5da61efb3a61a5bdcdfc3e9e2a5abdac8a8

[embik]

/cherry-pick release-0.4

[kcp-ci-bot]

@embik: once the present PR merges, I will cherry-pick it on top of release-0.4 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.4

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[SimonTheLeg]

/retest

[xrstf]

/retest

[kcp-ci-bot]

@embik: new pull request created: #107

In response to this:

/cherry-pick release-0.4

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.