Remove unused ArrayRef::is_arrow #33787

Job	Run time
Python CUDA (test)	4m 55s
validate-workflow-yaml	7s
Check build with minimal dependencies	2m 13s
Python (lint)	1m 14s
Rust build (wasm32 with default features)	8m 41s
lint-toml	9s
Rust build (all-features)	7m 55s
Rust build (default features)	7m 59s
C/C++ (lint)	8s
Check generated source files are up to date	59s
Python (test)	2m 17s
measurement_id golden vectors	12s
Rust (btrblocks golden corpus)	53s
Rust (lint, no default)	2m 32s
Java	2m 27s
Rust build (with tokio dispatcher)	2m 36s
C++ API	2m 0s
License Check and Audit Check (bans licenses sources)	1m 0s
WASM integration smoke test	2m 28s
License Check and Audit Check (advisories)	44s
C API test build	54s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	4s
DuckDB libraries available in R2	2s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
SQL logic tests	5m 2s
Rust (lint)	2m 21s
Rust tests (linux-arm64)	5m 33s
Rust (docs)	2m 59s
Rust tests (windows-x64)	7m 17s
	1h 15m 41s

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