Tests

Remove reliance on the `CloudMessage` class when handling messages (#… #1181

Job	Run time
PHP 8.1, lowest deps	38s
Backward Compatibility Check	41s
PHP 8.1, highest deps	40s
PHP 8.2, lowest deps	40s
PHP 8.2, highest deps	36s
PHP 8.3, lowest deps	35s
PHP 8.3, highest deps	35s
PHP 8.4, highest deps	34s
	4m 59s

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