Remove unused ArrayRef::is_arrow #33799

Job	Run time
validate-workflow-yaml	6s
Python CUDA (test)	2m 26s
Python (lint)	44s
measurement_id golden vectors	13s
lint-toml	6s
Rust (lint, no default)	2m 39s
Rust build (default features)	2m 29s
Python (test)	2m 12s
Rust build (wasm32 with default features)	56s
C/C++ (lint)	8s
Rust build (all-features)	2m 30s
Check generated source files are up to date	39s
C API test build	36s
WASM integration smoke test	41s
License Check and Audit Check (bans licenses sources)	1m 0s
C++ API	1m 59s
Java	2m 26s
Check build with minimal dependencies	2m 37s
Rust (btrblocks golden corpus)	25s
License Check and Audit Check (advisories)	49s
Rust build (with tokio dispatcher)	43s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	5s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
DuckDB libraries available in R2	4s
Rust tests (windows-x64)	7m 23s
Rust (lint)	2m 5s
SQL logic tests	1m 42s
Rust (docs)	2m 15s
Rust tests (linux-arm64)	4m 23s
	44m 21s

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