When ActorAssignees is true (github.com), the --add-assignee and
--remove-assignee flag flows now pass logins directly to
ReplaceActorsForAssignableByLogin instead of bulk fetching all
assignable actors and resolving logins to node IDs.
Changes:
- New AssigneeLogins() method on Editable that computes the final
login set (defaults + add - remove) without ID resolution
- UpdateIssue: call AssigneeLogins + ByLogin when ActorAssignees is true
- EditableOptionsFetch: skip assignee bulk fetch for flag flows on
github.com (only fetch on GHES where ID resolution is needed)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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