random: Perform fewer iterations if SKIP_SLOW_TESTS is set (#12279)

Co-authored-by: Tim Düsterhus <tim@bastelstu.be>

Deprecate MT_RAND_PHP (#11560)

see https://wiki.php.net/rfc/deprecations_php_8_3#mt_rand_php

Add `Randomizer::getBytesFromString()` method (#9664)

* Add `Randomizer::getBytesFromAlphabet()` method

* Rename `getBytesFromAlphabet` to `getBytesFromString`

* [ci skip]

Add `Randomizer::getBytesFromString()` method (#9664)

* Add `Randomizer::getBytesFromAlphabet()` method

* Rename `getBytesFromAlphabet` to `getBytesFromString`

* [ci skip] Add NEWS/UPGRADING for Randomizer::getBytesFromString()

Co-authored-by: Tim Düsterhus <tim@bastelstu.be>

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