Add NoDiscard-attribute to harden the code when it comes to signature… #1539

Job	Run time
PHP-Linter (8.2) / linter	11s
PHP-Linter (8.3) / linter	17s
PHP-Linter (8.5) / linter	18s
Linter / json-linter	27s
PHP-Linter (8.4) / linter	14s
Linter / yaml-linter	7s
Linter / style-linter	-1s
Linter / ecmascript-linter	-1s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Quality control	-1s
Code coverage	-1s
Security checks	-1s
Cleanup artifacts	0s
	1m 29s

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