BuildPullRequestBody reads the pull request template, takes parameters, and updates the content.

CommitAndPull commits changes, creates a pull request, and optionally processes subdirectories if `allFlag` is true.

CreatePullRequest creates a new pull request on GitHub.

ProcessSingleRepository commits changes and creates a pull request for a single repository.

ProcessSubdirectories iterates over subdirectories and calls CommitAndPull on each.

PullRequest represents the body of a pull request creation request.