rust: str: take advantage of the `-> Result` support in KUnit `#[test]`'s

Since now we have support for returning `-> Result`s, we can convert some
of these tests to use the feature, and serve as a first user for it too.

Thus convert them, which allows us to remove some `unwrap()`s.

We keep the actual assertions we want to make as explicit ones with
`assert*!`s.

Reviewed-by: David Gow <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Split the `CString` simplification into a new commit. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

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