PR to Github fails if a branch called supernova exists already

[arcataroger]

Describe the bug
When targeting Github for a build, target repo cannot have a branch named supernova or the PR creation will fail with the error:

Error exporting to github: Error: fatal: cannot lock ref 'refs/heads/supernova/style-dictionary': 'refs/heads/supernova' exists; cannot create 'refs/heads/supernova/style-dictionary'

I think this is because the exporter tries to create a supernova/style-dictionary branch to do its work on?

Once I removed the supernova branch on that repo, the export worked fine.

Expected behavior
There probably shouldn't be a magically prohibited branch name in the target repo, and especially not supernova. This error happened when I added a new supernova branch to my repo to test... well, Supernova :)

Maybe instead of creating a branch called supernova/style-dictionary, it could be something randomly-generated or ID-based, like supernova-exporter-{workspaceId or UUID}/style-dictionary}, to remove the possibility of an unintentional conflict?

Screenshots