The post-creation Issues 2.0 mutations (issue type, parent, blocked-by,
blocking) ran sequentially in three separate apply* helpers. Replace
them with a single call to api.DeferredUpdateIssue, which fans the
mutations out in parallel and joins their errors. The new
newCreateDeferredOpts helper resolves the user-supplied refs to node
IDs (re-using the cached opts.issueTypeID from the interactive prompt)
and hands them to the orchestrator.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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