Add TODO requestReviewsByLoginCleanup on static reviewer MultiSelect

Mark the legacy static MultiSelect reviewer path for cleanup once
GHES supports requestReviewsByLogin and search-based selection can
be used universally.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: BagToad

pkg/cmd/pr/shared/survey.go

@@ -271,6 +271,9 @@ func MetadataSurvey(p Prompt, io *iostreams.IOStreams, baseRepo ghrepo.Interface
 			}
 			values.Reviewers = selectedReviewers
 		} else if len(reviewers) > 0 {
+			// TODO requestReviewsByLoginCleanup
+			// The static MultiSelect path can be removed once GHES supports
+			// requestReviewsByLogin and search-based selection is always used.
 			selected, err := p.MultiSelect("Reviewers", state.Reviewers, reviewers)
 			if err != nil {
 				return err