Tests: Improve Windows & macOS compatibility (#974) #717

Job	Run time
Build Phar	29s
Functional - WP trunk on PHP 7.4 with MySQL 5.6	5m 26s
Functional - WP latest on PHP 7.3 with MySQL 8.0	6m 37s
Functional - WP trunk on PHP 8.5 with MySQL 5.7	4m 47s
Functional - WP latest on PHP 7.2 with MySQL 8.0	6m 44s
Functional - WP latest on PHP 8.5 with MySQL 8.0	4m 45s
Functional - WP 4.9 on PHP 7.2 with MySQL 5.6	6m 53s
Functional - WP latest on PHP 7.4 with MySQL 8.0	6m 44s
Functional - WP trunk on PHP 7.4 with MySQL 5.7	6m 41s
Functional - WP trunk on PHP 8.5 with MySQL 8.0	4m 50s
Functional - WP trunk on PHP 8.5 with MySQL 5.6	5m 32s
Functional - WP trunk on PHP 7.4 with MySQL 8.0	6m 43s
Deployment	12s
Build RPM package	-1s
Build DEB package	-1s
	1h 6m 21s

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