Auto merge of #45900 - rkruppe:u128-to-f32-saturation-by-default, r=alexcrichton

Make saturating u128 -> f32 casts the default behavior

... rather than being gated by `-Z saturating-float-casts`. There are several reasons for this:

1. Const eval already implements this behavior.
2. Unlike with float->int casts, this behavior is uncontroversially the right behavior and it is not as performance critical. Thus there is no particular need to make the bug fix for u128->f32 casts opt-in.
3. Having two orthogonal features under one flag is silly, and never should have happened in the first place.
4. Benchmarking float->int casts with the -Z flag should not pick up performance changes due to the u128->f32 casts (assuming there are any).

Fixes #41799

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