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fix(cli/alpha): remove redundant guard and check checkout error in alpha update push

Remove a redundant nested if opts.Push guard and check the git checkout
error that was previously discarded with _ in the alpha update push path.

The inner if opts.Push on line 209 is always true because the outer guard
on line 208 already checks the same field. This is a copy-paste artifact.

The git checkout error on line 211 is silently discarded with _. While the
checkout is typically a no-op (the squash path already leaves the user on
the output branch), silently discarding the error means any systemic git
failure (corrupted state, locked index) is hidden from the user, who sees
Update completed successfully despite the error.

The error check pattern matches the identical checkout handling at
lines 197-198 for the ShowCommits path.

Introduced in #5013 (2025-08-18).

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>