Remove force_hash_collisions flag above the function dev_ceil

[Kev1n8]

Which issue does this PR close?

Closes #11658.

Rationale for this change

The issue is due to a test helper function dev_ceil decorated by flag not force_hash_collision resulting it invisible for some test functions.

What changes are included in this PR?

I removed the #[cfg(not(force_hash_collisions))] above the function dev_ceil, which makes it visible for the test functions.

Are these changes tested?

Passed cargo test -p datafusion-physical-plan --features=force_hash_collisions

Are there any user-facing changes?

[Kev1n8]

The tests are failing in

     #[template]
     #[rstest]
     fn batch_sizes(#[values(8192, 10, 5, 2, 1)] batch_size: usize) {}

I've singled out join_inner_two for evaluation as follows:

    #[tokio::test]
    async fn my_join_inner_two_test() -> Result<()> {
        let batch_size= 5;  // specifying batch_size to 5
        ...
    }

and I found out that the test could pass with test --package datafusion-physical-plan --lib joins::hash_join --features=force_hash_collisions.
However, it fails test --lib --features=force_hash_collisions,avro hash_join.
I've put effort in it but unfortunately fail to see what is causing this.

[Kev1n8]

I would like to close this draft. Sorry for not being able to complete it despite the effort I put in.

[alamb]

Thank you @Kev1n8 -- this one sounds tricky