Revert "ParallelConfigFactory - no need for class-level variable" #1669

Job	Run time
Entrypoint low-PHP compat	14s
PHP 7.4 Fixer with lowest deps	52s
PHP 7.4 tests with lowest deps	3m 8s
PHP 8.0 Fixer	41s
PHP 8.0 tests	3m 4s
PHP 8.1 Fixer with Symfony ^6	48s
PHP 8.1 tests with Symfony ^6	3m 17s
PHP 8.2 Fixer	45s
PHP 8.2 tests	3m 35s
PHP 8.3 Fixer	42s
PHP 8.3 tests	3m 28s
PHP 8.3 Fixer with migration rules	1m 10s
PHP 8.3 tests with migration rules	3m 55s
PHP 8.3 Fixer with Symfony ^7	44s
PHP 8.3 tests with Symfony ^7	3m 21s
PHP 8.3 code coverage	4m 45s
PHP 8.3 mutation tests	27s
PHP 8.3 Fixer on Windows	1m 43s
PHP 8.3 tests on Windows	2m 21s
PHP 8.3 Fixer on macOS	1m 38s
PHP 8.3 tests on macOS	1m 48s
PHP 8.4 Fixer	57s
PHP 8.4 tests	3m 39s
Deployment checks	46s
	47m 48s

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