Fix bug where unwanted v is prepended to tag name

[ludfjig]

What does this change

Fixes bug

What issue does it fix

Closes #2914

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Notes for the reviewer

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Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
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Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR

[schristoff]

gj adding test

[schristoff]

/azp run porter-integration

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[schristoff]

if it is telemetry test just merge anyways

[troy0820]

You are facing test failures, outside of this changeset. These are non-blocking but it would be nice if you could get them in.