[gmq-sim] changefeedccl: add syntax support for DB-level ALTER CHANGEFEED#434

rishabh7m wants to merge 1 commit intomaster-gmqcrltest-issue-syncing/cockroach-fork:master-gmqfrom

stable-gmq-sim--gmq-20251121-161231crltest-issue-syncing/cockroach-fork:stable-gmq-sim--gmq-20251121-161231Copy head branch name to clipboard