fix: RunEnd array correctly encodes all null arrays #5691

Job	Run time
bench test	5m 8s
License Check and Audit Check	2m 6s
Rust build (all-features)	7m 59s
Check generated proto/fbs files are up to date	44s
Rust build (default features)	3m 39s
miri	14m 20s
Python (lint)	3m 36s
Rust build (with tokio dispatcher)	4m 28s
Python (test)	4m 49s
Rust build (with compio dispatcher)	5m 33s
Rust (docs)	1m 0s
Rust (tests)	8m 28s
Rust build (with tokio+compio dispatcher)	3m 41s
Rust build (wasm32 with default features)	1m 55s
	1h 7m 26s

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