okaneco 59ca7679c7 slice: Remove some uses of unsafe in first/last chunk methods ...

Remove unsafe `split_at_unchecked` and `split_at_mut_unchecked`
in some slice `split_first_chunk`/`split_last_chunk` methods.
Replace those calls with the safe `split_at` and `split_at_checked` where
applicable.

Add codegen tests to check for no panics when calculating the last
chunk index using `checked_sub` and `split_at`

2025-03-30 12:45:04 -04:00

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