Minor: Remove the unreached simplification rule for `0 / 0` (#7405) #295

Job	Run time
cargo test (mac)	28m 10s
cargo check	9m 33s
Verify MSRV	10m 14s
Check cargo fmt	54s
Verify Vendored Code	1m 21s
cargo test (win64)	30m 21s
cargo test datafusion-cli (amd64)	5m 12s
cargo test (amd64)	19m 55s
cargo test doc (amd64)	17m 49s
cargo doc	6m 46s
cargo examples (amd64)	9m 42s
check Cargo.toml formatting	2m 6s
clippy	8m 0s
check configs.md is up-to-date	4m 17s
cargo test hash collisions (amd64)	23m 16s
Run sqllogictest with Postgres runner	4m 57s
verify benchmark results (amd64)	34m 3s
cargo test pyarrow (amd64)	3m 37s
	3h 40m 13s

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