Add query result helpers and guard call sites #2119

Job	Run time
Get DuckDB version	6s
Build extension binaries / Generate matrix	7s
Build extension binaries / linux_amd64	31m 43s
Build extension binaries / windows_amd64	34m 39s
Build extension binaries / wasm_eh	10m 15s
Build extension binaries / matrix.duckdb_arch	0s
Deploy extension binaries / Generate matrix	9s
Deploy extension binaries / Deploy to nightly (linux_amd64)	1m 17s
Deploy extension binaries / Deploy to nightly (wasm_eh)	1m 2s
Deploy extension binaries / Deploy to nightly (windows_amd64)	1m 3s
	1h 20m 21s

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