[stable32] refactor: consolidate pdf fixtures #5510

Job	Run time
changes	3s
matrix	11s
SQLite PHP 8.3 Nextcloud stable32 coverage	3m 4s
SQLite PHP 8.3 Nextcloud stable32 debug	2m 50s
phpunit-sqlite-summary	2s
finish-coverage	0s
	6m 10s

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