Add subject-id signal constant + enum #3199

Job	Run time
Security checks	13s
Quality control	24s
PHP-Linter (8.2) / linter	22s
PHP-Linter (8.4) / linter	13s
PHP-Linter (8.1) / linter	18s
PHP-Linter (8.3) / linter	11s
Linter / json-linter	29s
Linter / yaml-linter	8s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.3, ubuntu-latest	22s
Unit tests, PHP 8.1, windows-latest	50s
Unit tests, PHP 8.2, windows-latest	49s
Unit tests, PHP 8.4, ubuntu-latest	37s
Unit tests, PHP 8.2, ubuntu-latest	21s
Unit tests, PHP 8.1, ubuntu-latest	20s
Unit tests, PHP 8.3, windows-latest	49s
Unit tests, PHP 8.4, windows-latest	41s
Code coverage	7s
Cleanup artifacts	3s
	7m 17s

Provide feedback