Add AbstractTestContainer class #469

Job	Run time
PHP-Linter (8.4) / linter	12s
Linter / json-linter	22s
PHP-Linter (8.3) / linter	11s
PHP-Linter (8.5) / linter	12s
Linter / yaml-linter	6s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.5, windows-latest	1m 6s
Unit tests, PHP 8.4, windows-latest	1m 11s
Unit tests, PHP 8.5, ubuntu-latest	40s
Unit tests, PHP 8.3, ubuntu-latest	26s
Unit tests, PHP 8.3, windows-latest	1m 13s
Unit tests, PHP 8.4, ubuntu-latest	28s
Code coverage	6s
Security checks	19s
Quality control	34s
Cleanup artifacts	4s
	7m 10s

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