[johnpryan]

The --head flag is required for gh pr create:

Creating the PR.
 > gh pr create --repo flutter/devtools --draft --title "Prepare for release 2.62.0" --fill
aborted: you must first push the current branch to a remote, or use the --head flag
ProcessException: Failed with exit code: 1. 

[gemini-code-assist]

Code Review

This pull request updates the ReleaseHelperCommand in tool/lib/commands/release_helper.dart to include the --head option with the releaseBranch value when executing the pull request creation command. There are no review comments, and the changes look correct, so I have no feedback to provide.