Add AbstractTestContainer class #468

Job	Run time
Linter / json-linter	24s
PHP-Linter (8.4) / linter	13s
PHP-Linter (8.3) / linter	13s
PHP-Linter (8.5) / linter	13s
Linter / yaml-linter	6s
Linter / ecmascript-linter	-1s
Linter / style-linter	-1s
Unit tests, PHP 8.3, ubuntu-latest	32s
Unit tests, PHP 8.5, windows-latest	1m 5s
Unit tests, PHP 8.5, ubuntu-latest	27s
Unit tests, PHP 8.3, windows-latest	1m 3s
Unit tests, PHP 8.4, ubuntu-latest	29s
Unit tests, PHP 8.4, windows-latest	1m 12s
Code coverage	11s
Quality control	33s
Security checks	18s
Cleanup artifacts	5s
	7m 2s

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