Use concat to simplify Nested Scalar creation #23124

Job	Run time
cargo test (win64)	42m 21s
cargo test (macos)	21m 57s
build with wasm-pack	2m 7s
cargo check	2m 58s
Check cargo fmt	32s
Verify Vendored Code	47s
Verify MSRV (Min Supported Rust Version)	6m 52s
cargo test (amd64)	9m 43s
cargo test doc (amd64)	11m 27s
clippy	5m 33s
cargo test hash collisions (amd64)	9m 0s
cargo test datafusion-cli (amd64)	3m 34s
cargo doc	3m 28s
cargo examples (amd64)	8m 33s
Run sqllogictest with Postgres runner	3m 15s
cargo test pyarrow (amd64)	2m 24s
verify benchmark results (amd64)	10m 31s
check Cargo.toml formatting	1m 14s
check configs.md is up-to-date	2m 40s
	2h 28m 56s

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