Marketplace fetch w/ ref shouldn't do a git pull #1515
Description
Describe the bug
When fetching a marketplace repo (github or git url), the CLI does a git pull --ff-only regardless of whether there's a ref specified in the marketplace definition. This can lead to a failure depending on what the ref specifies (branch should be ok, tag or commit may not be). The plugin repo fetching does this correctly, I believe, so that logic likely just needs to be ported over.
Affected version
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Steps to reproduce the behavior
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Expected behavior
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Additional context
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