Retrieves a list of branches for the specified project.
You can obtain a project_id by listing the projects for your Neon account.

Each Neon project has a root branch named main.
A branch_id value has a br- prefix.
A project may contain child branches that were branched from main or from another branch.
A parent branch is identified by the parent_id value, which is the id of the parent branch.
For related information, see Manage branches.

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