[php-src] Issue #8738: `opcache` should not be honored by `--EXTENSIONS--` section when run in CI

Issue: https://github.com/php/php-src/issues/8738 Author: mvorisek ### Description Currently, especially the JIT tests, require opcache ext via --EXTENSIONS-- section. I belive that is suboptimal, as all such tests should be run also /wo opcache to test if the expectations are matched also /wo opcache ext. This applies only for CI (GitHub Actions, ...) where we run all tests /w and /wo opcache. In nightly, we run all tests even with multiple opcache.jit variants. Therefore I propose additional test parameter for run-tests.php which will accept a matrix in JSON format of all tested ini configurations like: ``` [ { "ext-opcache": false }, { "ext-opcache": true, "opcache.jit": 1255 }, { "ext-opcache": true, "opcache.jit": 1235 } ] ``` and when: a) a test requires opcache ext, the requirement will be ignored, as thanks to 2nd (and 3rd) test matrix config, we are guaranteed this required/prefered configuration will be tested b) a test requires specific ini option like opcache.jit=1255, it will be ignored as well, as again, this config is guaranteed to be tested in other run