test: re-enable merge join test with forced collisions #812

Job	Run time
cargo check	10m 27s
build with wasm-pack	2m 34s
cargo test (macos)	11m 11s
cargo test (macos-aarch64)	9m 56s
Verify Vendored Code	36s
cargo test (win64)	43m 47s
Check cargo fmt	45s
Verify MSRV (Min Supported Rust Version)	7m 0s
Run sqllogictest with Postgres runner	3m 59s
check Cargo.toml formatting	2m 59s
cargo doc	4m 7s
clippy	5m 52s
cargo test hash collisions (amd64)	14m 7s
cargo test (amd64)	11m 9s
cargo test datafusion-cli (amd64)	3m 50s
cargo test doc (amd64)	14m 27s
cargo examples (amd64)	13m 31s
cargo test pyarrow (amd64)	2m 47s
verify benchmark results (amd64)	11m 59s
check configs.md is up-to-date	3m 3s
	2h 58m 6s

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