Split SplitBy::Layout into Layout and LayoutSubSplitting variants #34760

Job	Run time
Rust build (wasm32 with default features)	1m 6s
Check generated source files are up to date	40s
Rust (lint, no default)	2m 42s
measurement_id golden vectors	12s
Python (test)	2m 29s
lint-toml	10s
Rust build (default features)	2m 41s
Java	2m 28s
License Check and Audit Check (bans licenses sources)	53s
Python (lint)	48s
validate-workflow-yaml	5s
C/C++ (lint)	6s
License Check and Audit Check (advisories)	51s
Rust build (with tokio dispatcher)	55s
Check build with minimal dependencies	2m 19s
WASM integration smoke test	1m 35s
Rust (btrblocks golden corpus)	29s
C API test build	34s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	5s
Rust build (all-features)	3m 4s
Python CUDA (test)	2m 54s
C++ API	2m 6s
DuckDB libraries available in R2	2s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-1s
Rust tests (windows-x64)	7m 24s
SQL logic tests	2m 17s
Rust (lint)	2m 13s
Rust tests (linux-arm64)	4m 45s
Rust (docs)	2m 40s
	48m 32s

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