stats: Use dynamic stat-name for locality_zone_stat_name_ in upstream code. #11768
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Commit Message: locality zones may not change much, but there's no great place to store symbolic StatNames for them. To avoid contention issues on the symbol table when processing EDS requests, make that a dynamic stat.
Additional Description:
Risk Level: low
Testing: //test/..., release-build //test/integration:stats_integration_test
Docs Changes: n/a
Release Notes: n/a
Fixes: #11573