Missing remote branch tracking after running `shortcake submit` on a local-only adopted branch

When running shortcake submit after shortcake adopt on an untracked local branch, the newly created remote branch is not tracked

Expected behavior:

• A remote branch gets created
• The local branch tracks the remote branch

Current behavior:

• A remote branch gets created
• The local branch does not track the new remote branch

Example:

❯❯❯ git checkout -b some-branch
Switched to a new branch 'some-branch'

❯❯❯ sc adopt
Adopted branch 'some-branch' with parent 'main'

❯❯❯ sc submit
Submitting some-branch... created PR #2

Submitted PRs:
  • some-branch: https://github.com/buurro/some-repo/pull/2

❯❯❯ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=origin/<branch> some-branch

Reproduce the issue with a local branch using shortcake adopt, then shortcake submit, and inspect how submit creates the remote branch and records branch tracking. Done means the created remote branch is tracked by the local branch and a subsequent git pull no longer reports missing tracking information.