Add TestContainer and start using it to reduce overhead #1289

Job	Run time
PHP-Linter (8.5) / linter	11s
PHP-Linter (8.4) / linter	10s
Linter / yaml-linter	6s
Linter / json-linter	20s
PHP-Linter (8.3) / linter	12s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, windows-latest	40s
Unit tests, PHP 8.4, windows-latest	43s
Unit tests, PHP 8.5, ubuntu-latest	25s
Unit tests, PHP 8.3, ubuntu-latest	24s
Unit tests, PHP 8.4, ubuntu-latest	21s
Unit tests, PHP 8.3, windows-latest	44s
Code coverage	6s
Quality control	18s
Security checks	13s
Cleanup artifacts	3s
	4m 56s

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