Fix git_pillar edge case for remote repos without a master branch #33727
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When the remote repository does not have a master branch, on the initial
checkout there will be no ref in refs/remotes/origin for this branch,
leading to an error being logged and the checkout failing.
Instead of failing the checkout, in these cases we'll create the initial
local HEAD based on the ref we will eventually check out, since we know
for a fact that this ref exists.
Resolves #33725.