Allow running reduce_parent operations on stack allocated parents #30212

Job	Run time
Rust build (wasm32 with default features)	2m 1s
Rust (lint, no default)	1m 46s
Public API lock files	1m 4s
C/C++ (lint)	10s
Rust (lint)	2m 35s
Rust build (all-features)	4m 18s
Python (test)	2m 29s
validate-workflow-yaml	7s
Check generated source files are up to date	45s
Check build with minimal dependencies	1m 34s
C++ build	3m 13s
Rust tests (linux-arm64)	4m 4s
Rust (docs)	3m 3s
WASM integration smoke test	2m 2s
Rust build (default features)	4m 9s
Rust build (with tokio dispatcher)	1m 46s
SQL logic tests	3m 50s
Java	2m 12s
Python (lint)	42s
License Check and Audit Check (bans licenses sources)	48s
C API test build	42s
lint-toml	10s
License Check and Audit Check (advisories)	52s
Rust tests (windows-x64)	8m 42s
	53m 4s

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