Add TestContainer and start using it to reduce overhead #1288

Job	Run time
PHP-Linter (8.5) / linter	10s
Linter / yaml-linter	6s
PHP-Linter (8.4) / linter	9s
Linter / json-linter	21s
PHP-Linter (8.3) / linter	9s
Linter / style-linter	0s
Linter / ecmascript-linter	-1s
Unit tests, PHP 8.3, ubuntu-latest	23s
Unit tests, PHP 8.5, windows-latest	1m 1s
Unit tests, PHP 8.5, ubuntu-latest	23s
Unit tests, PHP 8.3, windows-latest	1m 46s
Unit tests, PHP 8.4, ubuntu-latest	24s
Unit tests, PHP 8.4, windows-latest	2m 11s
Code coverage	10s
Quality control	22s
Security checks	19s
Cleanup artifacts	6s
	7m 59s

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