Un-nest CanonicalizableElementTrait from Signed/SignableElementTrait #3504

Job	Run time
PHP-Linter (8.5) / linter	17s
PHP-Linter (8.3) / linter	11s
Linter / json-linter	33s
Linter / yaml-linter	5s
PHP-Linter (8.4) / linter	12s
Linter / ecmascript-linter	-1s
Linter / style-linter	-1s
Unit tests, PHP 8.5, windows-latest	50s
Unit tests, PHP 8.4, ubuntu-latest	21s
Unit tests, PHP 8.4, windows-latest	52s
Unit tests, PHP 8.3, windows-latest	55s
Unit tests, PHP 8.5, ubuntu-latest	21s
Unit tests, PHP 8.3, ubuntu-latest	16s
Code coverage	0s
Security checks	0s
Cleanup artifacts	0s
Quality control	0s
	4m 51s

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