Adds drain support to Spanner CDC source. - #39994

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acrites:spanner-cdc-drain

Commits on Sep 3, 2026

Adds drain support to Spanner CDC source. Overriding truncateRestriction on SDFs allows terminating immediately and changing to DROP TABLE IF EXISTS makes deletion idempotent.
acrites
committed
e274da4
Adds IF EXISTS to DROP INDEX calls and updates tests.
acrites
committed
12f2b7b