refactor(ast): Removed redundant type ast.AlterTableType_PG#4270

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asmyasnikov wants to merge 1 commit intosqlc-dev:mainfrom

ydb-platform:remove-ast-AlterTableType_PG

Commits on Jan 19, 2026

refactor(ast): Removed redundant type ast.AlterTableType_PG (no parsers which produces instance of this type)
asmyasnikov
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