Do not disable the PCRE JIT compiler by default but instead allow a potential performance boost for folks who have PCRE2 installed.
The current code was introduced in rPHU1422024de70d / https://web.archive.org/web/20240805021512/http://secure.phabricator.com/T13296 to work around an issue appearing in 2019 on Mac OS with early PHP 7.3 versions.
Online comments like https://github.com/bobthecow/psysh/issues/540#issuecomment-547847844 or https://github.com/squizlabs/PHP_CodeSniffer/issues/2475#issuecomment-862579574 imply that later PHP 7.3 versions work as expected.
Thus do not take all and any installations of Phorge into performance custody for some scope limited problem which existed six years ago.
See also https://www.php.net/manual/en/pcre.configuration.php#ini.pcre.jit
Closes T16084