Add AbstractTestContainer class #467

Job	Run time
PHP-Linter (8.3) / linter	12s
Linter / yaml-linter	7s
PHP-Linter (8.4) / linter	11s
Linter / json-linter	25s
PHP-Linter (8.5) / linter	14s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.4, windows-latest	1m 19s
Unit tests, PHP 8.3, windows-latest	1m 12s
Unit tests, PHP 8.5, windows-latest	1m 23s
Unit tests, PHP 8.5, ubuntu-latest	29s
Unit tests, PHP 8.3, ubuntu-latest	29s
Unit tests, PHP 8.4, ubuntu-latest	27s
Security checks	23s
Code coverage	6s
Quality control	36s
Cleanup artifacts	5s
	7m 38s

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