Unify structure for ext/random's randomizer tests (#9410)

* Unify structure for ext/random's engine tests (2)

This makes adjustments that were missed in
2d6a883b3a1e5ee4f225dce6

Unify structure for ext/random's randomizer tests (#9410)

* Unify structure for ext/random's engine tests (2)

This makes adjustments that were missed in
2d6a883b3a1e5ee4f225dce64584ad2522e8e391.

* Add `engines.inc` for ext/random tests

* Unify structure for ext/random's randomizer tests

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Unify structure for ext/random's engine tests (#9321)

* Remove user_xoshiro128plusplus.phpt

This test does not exercise any of the code paths of the random extension and
thus is

Unify structure for ext/random's engine tests (#9321)

* Remove user_xoshiro128plusplus.phpt

This test does not exercise any of the code paths of the random extension and
thus is no value-add.

* Unify structure for ext/random's engine tests

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Handle all-zero state in Xoshiro256** (#9250)

- Retry if the CSPRNG generates a zero state.
- Throw ValueError if the user passes a zero state.

Fixes GH-9249

Improve phrasing in argument value errors in ext/random (#9206)

This rephrases the error message for argument errors to be a proper English
sentence.

Co-authored-by: Máté Kocsis

Improve phrasing in argument value errors in ext/random (#9206)

This rephrases the error message for argument errors to be a proper English
sentence.

Co-authored-by: Máté Kocsis <kocsismate@woohoolabs.com>

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Implement Random Extension

https://wiki.php.net/rfc/rng_extension
https://wiki.php.net/rfc/random_extension_improvement