sql: extend SST writer support to legacy schema changer backfill #158684
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Previously, SST writer support during index backfill with distributed merge was only available in the declarative schema changer (added in #158456). This commit extends the same logic to the legacy schema changer. To avoid duplication, shared logic was extracted into a helper function reused by both.
Informs #158378
Epic: CRDB-48845
Release note: none