Fix run-tests.php --file-cache-prime with multiple workers (GH-22886)

* Fix run-tests.php --file-cache-prime with multiple workers

We want to remove the directory only before running tests, rather than for every
test. That causes races, but also defeats the purpose of priming the cache.

* Move opcache.opt_debug_level tests

These need to live in ext/opcache/tests to be skipped by run-tests.php for the
--file-cache-use tests, which won't compile the files and thus won't dump the
output.

* Mark preloading test as opcache.file_cache_only=0

Preloading requires shm.

Author: iluuu1994

Zend/tests/partial_application/preloading.phpt

@@ -4,6 +4,7 @@ PFA preloading
 opcache.enable=1
 opcache.enable_cli=1
 opcache.preload={PWD}/preloading.inc
+opcache.file_cache_only=0
 --SKIPIF--
 <?php
 if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');

…/array_map_foreach_optimization_006.phpt …/array_map_foreach_optimization_007.phptext/standard/tests/array/array_map_foreach_optimization_006.phpt renamed to ext/opcache/tests/array_map_foreach_optimization_007.phpt ext/standard/tests/array/array_map_foreach_optimization_006.phpt renamed to ext/opcache/tests/array_map_foreach_optimization_007.phpt

@@ -700,6 +700,12 @@ function main(): void
     verify_config($php);
     write_information($user_tests, $phpdbg);
 
+    if ($file_cache === 'prime') {
+        $cache_dir = get_file_cache_dir();
+        rmdir_recursive($cache_dir);
+        mkdir($cache_dir, recursive: true);
+    }
+
     if ($test_cnt) {
         $exts_tested = [];
         $exts_skipped = [];
@@ -1054,6 +1060,11 @@ function find_files(string $dir, bool $is_ext_dir = false, bool $ignore = false)
     closedir($o);
 }
 
+function get_file_cache_dir(): string
+{
+    return sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'php-run-tests-file-cache';
+}
+
 function rmdir_recursive($dir)
 {
     if (!file_exists($dir)) {
@@ -2091,11 +2102,7 @@ function run_test(string $php, $file, array $env): string
     $orig_ini_settings = settings2params($ini_settings);
 
     if ($file_cache !== null) {
-        $ini_settings['opcache.file_cache'] = sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'php-run-tests-file-cache';
-        if ($file_cache === 'prime') {
-            rmdir_recursive($ini_settings['opcache.file_cache']);
-            mkdir($ini_settings['opcache.file_cache'], recursive: true);
-        }
+        $ini_settings['opcache.file_cache'] = get_file_cache_dir();
         // Make sure warnings still show up on the second run.
         $ini_settings['opcache.record_warnings'] = '1';
         // File cache is currently incompatible with JIT.