Remove unused `AggregateOptions` struct and `scalar_update_factor` config setting #31560

Job	Run time
build with wasm-pack	2m 30s
cargo test (macos)	10m 15s
cargo check	8m 10s
cargo test (macos-aarch64)	9m 55s
cargo test (win64)	45m 23s
Check cargo fmt	39s
Verify MSRV (Min Supported Rust Version)	7m 1s
Verify Vendored Code	51s
cargo examples (amd64)	13m 19s
cargo test (amd64)	10m 6s
clippy	5m 28s
cargo doc	4m 26s
cargo test doc (amd64)	14m 33s
Run sqllogictest with Postgres runner	3m 38s
cargo test pyarrow (amd64)	2m 53s
verify benchmark results (amd64)	11m 56s
check Cargo.toml formatting	2m 56s
check configs.md is up-to-date	2m 47s
cargo test hash collisions (amd64)	14m 11s
cargo test datafusion-cli (amd64)	3m 58s
	2h 54m 55s

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