Add AbstractTestContainer class #470

Job	Run time
PHP-Linter (8.4) / linter	13s
Linter / json-linter	21s
Linter / yaml-linter	6s
PHP-Linter (8.3) / linter	11s
PHP-Linter (8.5) / linter	12s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.3, ubuntu-latest	32s
Unit tests, PHP 8.3, windows-latest	1m 10s
Unit tests, PHP 8.5, ubuntu-latest	30s
Unit tests, PHP 8.5, windows-latest	1m 13s
Unit tests, PHP 8.4, windows-latest	1m 3s
Unit tests, PHP 8.4, ubuntu-latest	32s
Security checks	24s
Code coverage	6s
Quality control	39s
Cleanup artifacts	3s
	7m 15s

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