Wire up MultiSelectWithSearch for assignees in MetadataSurvey, replacing
the static MultiSelect that required bulk fetching all assignable actors.
This applies to both gh pr create and gh issue create interactive flows
when selecting assignees via the 'Add metadata' prompt.
Changes:
- Add assigneeSearchFunc parameter to MetadataSurvey
- Skip assignee bulk fetch when search func is available
- New SearchRepoAssignableActors API function for repo-level search
(create flows have no issue/PR node ID yet)
- New RepoAssigneeSearchFunc in shared editable.go
- Refactor actorsToSearchResult helper shared by both search functions
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
11f177a8c3