[lts-active] fix(analyze): use route summaries as the analyzer route index
Merged
WB
4d ago+233+233+012345678901234567890123456789-141-141-012345678901234567890123456789
Backports #100081 to releases/lts/active.
Uses route summaries as the single analyzer route index so generated metadata routes export correctly. Clean cherry-pick with the original regression coverage; no compatibility adaptations required.