[TASK] Move and polish the PHPStan configuration and scripts #2321

Job	Run time
Composer Validate (8.3)	8s
PHP Lint (7.3)	21s
PHP Lint (7.4)	7s
PHP Lint (8.0)	11s
PHP Lint (8.1)	11s
PHP Lint (8.2)	13s
PHP Lint (8.3)	8s
PHP Lint (8.4)	7s
Static Analysis (composer:normalize, 8.3)	33s
Unit tests (7.3, lowest)	20s
Static Analysis (php:fixer, 8.3)	34s
Unit tests (7.3, highest)	15s
Static Analysis (php:md, 8.3)	24s
Unit tests (7.4, lowest)	19s
Static Analysis (php:rector, 8.3)	34s
Unit tests (7.4, highest)	15s
Static Analysis (php:stan, 8.3)	34s
Unit tests (8.0, lowest)	16s
Unit tests (8.0, highest)	25s
Unit tests (8.1, lowest)	17s
Unit tests (8.1, highest)	29s
Unit tests (8.2, lowest)	14s
Unit tests (8.2, highest)	15s
Unit tests (8.3, lowest)	25s
Unit tests (8.3, highest)	17s
Unit tests (8.4, lowest)	16s
Unit tests (8.4, highest)	16s
	8m 24s

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