Fix: Ensure there's a "v" prefix in markers version

[azylinski]

Ensure there's a consistent versioning (with "v" prefix) in build markers.

Constraint:

• the version param MAY have a "v" prefix, e.g. 1.25.0 or v1.24.4-rc.0
• fileName MUST NOT have a "v" prefix, e.g.: latest-green-1.23.txt, latest-1.22.txt
• content (marker) MUST have "v" prefix, e.g.: v1.22.0-alpha.3

Ref: https://github.com/kubernetes-sigs/kubetest2/pull/185#discussion_r915831056

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[k8s-ci-robot]

Hi @azylinski. Thanks for your PR.

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[mborsz]

/lgtm /assign @BenTheElder

[k8s-ci-robot]

@mborsz: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubernetes-sigs/kubetest2/pull/209#issuecomment-1204938752): >/lgtm >/assign @BenTheElder Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: azylinski, BenTheElder

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/kubetest2/blob/master/OWNERS)~~ [BenTheElder] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[BenTheElder]

@mborsz the bot comment means you're not a kubernetes-sigs member, you can correct that pretty easily in https://github.com/kubernetes/org since you're already a member of github.com/kubernetes org, FWIW