refactor: share the push-and-report tail of the field setters

set-priority, set-state, set-assignee, and set-labels each repeated the same tail: push the issueUpdate field, and on success update the heading or drawer at the marker, message, and surface the buffer; on failure, message. I pulled that into pearl--push-issue-field, which takes the fields alist, a success thunk (the per-field buffer update), and the two messages. Each command keeps its own completion source, guards, and id resolution. No behavior change; 353 tests green.

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