Un-nest CanonicalizableElementTrait from Signed/SignableElementTrait #3508

Job	Run time
PHP-Linter (8.3) / linter	15s
Linter / yaml-linter	6s
Linter / json-linter	27s
PHP-Linter (8.4) / linter	19s
PHP-Linter (8.5) / linter	12s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, windows-latest	1m 6s
Unit tests, PHP 8.3, ubuntu-latest	27s
Unit tests, PHP 8.4, ubuntu-latest	27s
Unit tests, PHP 8.3, windows-latest	1m 0s
Unit tests, PHP 8.4, windows-latest	1m 5s
Unit tests, PHP 8.5, ubuntu-latest	28s
Code coverage	7s
Security checks	20s
Quality control	42s
Cleanup artifacts	6s
	7m 7s

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