Add OPCache file cache and JIT blacklist functions

[jordikroon]

Adds documentation for two OPCache functions:

• opcache_is_script_cached_in_file_cache: checks if a script is cached in OPCache file cache
• opcache_jit_blacklist: blacklists a function from being JIT compiled

The opcache_jit_blacklist function exists since 2024 but has never been documented. Additionally opcache_is_script_cached_in_file_cache is new since PHP 8.5.

References: https://github.com/php/doc-en/issues/4995 https://github.com/php/php-src/pull/15559 https://github.com/php/php-src/pull/16979

Doc tracker: https://github.com/php/doc-en/issues/3872 https://github.com/php/doc-en/issues/4886