[Infra] Refactor release branch creation and add step dependency

[rlazo]

Replaced the external action for branch creation with a native GitHub CLI command to create the release branch.

Added a dependency to the create-branch job from the create-pull-request job to ensure it runs only after the branch has been successfully created.

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[rlazo]

/gemini review

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Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.