`opcache` should not be honored by `--EXTENSIONS--` section when run in CI

[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